What are the Classes FOR?

[Kevin]

WARRIOR: main tank. 
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Can be very solid DPS. You really only need one or two tanks in most cases (though Molten Core makes 4 to 6 very handy at times). Even my protection spec little gnome can climb the DPS charts if you don't need things to beat on me. The other warriors are also very good at tanking lose mobs with their snap aggro. I'm starting to think that mocking blow is really designed so you can get an hold aggro while the CC'rs reapply the CC. Since you can mocking blow then switch off and have the thing smacking you for 6 seconds. It's what I do with Gnolack now. If the mob isn't CC'd by then I drop to def stance taunt it, wait a bit more then start tanking it. Of course if there is a DoT on it or others are firing I tank it right away. An arms or fury warrior can do this role just as well.

PRIEST: main healer/debuffer.
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Yep, and because of shields, AoE heals, and very important debuffs and CC they are clearly better healers than druids. They also get 2 mana per int instead of 1.5 like a druid so a non restoration spec druid has a weaker mana pool. Restoration with innervate has a bigger pool though. But there are a lot of reasons that a priest is a better healer than a druid, paladin or shaman.

DRUID: secondary healer. 
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Right now that is what they generally are because as pointed out there usually aren't enough healers. Taranna in her bear gear (though I am mainly cat focused) can tank quite well. Better than a paladin in some cases because I do have a taunt. If there weren't all the warriors around on our MC runs and if we didn't need Taranna to heal I know she could tank one of the dogs in the packs just as easily as Gnolack could. But we don't need her to tank there are better choices. Last couple of scholo and strat runs she has been allowed to do what she wants, which was mostly cat form and I was holding 115+ DPS easily. I was battling with the mages for the spots behind the rogues and the locks on the total damage dealt. I off tanked a few times a bear and I did some healing, decursing and innervating of the priests. Druids, in 15 man raids really do get to be hybrids. In Onyxia I actually don't heal on the warder pulls after the DPS call goes out and I can contribute OK single target ranged damage with just moonfire and wrath. A druid with a priest or another druid around will get that chance too, but lack of healers has me as a healer. She is 34/17 restoration/feral. A balance druid can do alright DPS as well. I think the druid's roll is fine as a healer but there are so many other choices for tanking and DPS that they don't get to do that. Get to do it so little that I actually forgot that I could do CC in a messy UBRS situation and there was a time that we got two warders by mistake in Onyxia and I wonder how well it would have worked for me and the other druid to chain sleep one of them?

PALADIN: secondary healer/buffer/debuffer. 
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Paladins can heal 5 man instances. Tal healed a tribute run with Sharanna, I've healed all the instances Maraudon and below at level appropriate. End game paladins can do OK DPS in 15 man and provide solid healing, Katrin was a big reason the UBRS run that started with just me and a bunch of pubbies but end as mostly Lurkers/Basin/CA was successful because of his healing. The paladin who started the raid was actually doing pretty well on DPS until we got organized enough to have the rogues, mages and locks living through battles. :) A paladin can tank some in Molten Core as well. We have used paladins on the 5 corehound packs when we only had 4 warriors and not enough healers. The are supposed to be buffers but it's a pain in the ass for them to do it with the really short durations. The auras are big buffs as well, 60 more fire resist is quite nice for those that get to stand up in all the AoE fire attacks. The heals they throw around are nice too. I do think that a paladin is operating as Blizzard intended end game, but I don't think that is how most paladin players want them too. Really it seems in Molten Core that a paladin is cleansing casting buffs and throwing a heal out here or there. I think a retribution spec paladin if they wanted to could get in and provid a decent amount of DPS while self healing, though it won't be rogue or lock DPS, I think a paladin might be able to keep up with mage DPS in Molten Core, partly because mage single target DPS really isn't that good.

SHAMAN: secondary healer/buffer/debuffer.
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Shaman have better snap aggro than a paladin and can tank in the 15 man raids. I don't know about molten core. I don't think lack of plate would be that big a deal, I think they would do as well as a druid would. I think a paladin might be able to heal better than a shaman but both can heal 5 mans and shaman have the ultimate wipe recovery ability with the self rez and then rez everyone else. They provide very solid buffs with the totems and can throw some nice healing around. They are not the debuffer that a paladin is even with the totems. A shaman can also provide a good bit of DPS and has good control of that DPS. Shaman look to be doing what they are intended and are a very fluid hybrid.

ROGUE: pure DPS Monkey.
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Quark covered it well. Working as intended in my book.

HUNTER: ...DPS? 
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As Darian said they are high utility actually. There are times that I've wished I had one around for utility. They are aren't bad at DPS and the patch is going to help that. The pet buffs are going to help the DPS even more as well since pets should be much more viable in Molten Core. I have not seen BWL to know about in there though. Though a well played hunter when combined with pet can already compete for the DPS on the 10 and 15 man raids. I like having one or 2 in any 15 man, but since there are a lot of hunters they get excluded a lot as well.

MAGE: AE damage king/crowd control. 
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The are not AoE damage kings in most 10 or 15, the lock beats them. In Molten Core Blizzard is nice on the firelords and the 5 hound packs but most of MC is single target so a mage is reduced to frost bolt/arcane missles and in some fights they are just a debuffer. They have good CC utility in the 10 and 15 mans but really depending on the group mix you don't need any CC in strat, scholo or BRS. I think the mage needs some work for the end game 40 man raids. Working as intended for 5 man though.

WARLOCK: DPS/utility.
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Huge amounts of utility. Can do huge AoE and single target DPS as well. In the small raid they will often beat rogues for total damage because of the high single target and the frequent use of AoE they get to do. I personally think the class is too stong in PvE.