Is using stealth an exploit?

[vor_lord]

Lately I've been running into LBRS with a group made solely of druids and rogues. We stealth past most of the mobs, using distract for the tricky bits, and position ourselves near a boss. We then take down the mobs around the boss so we have room to fight, kill the boss  and  then move on to the next loot-filled target.

When this is done right you can finish a run in 30 to 45 minutes. It's also great fun.

Recently several people in my guild have said they believe that this is an exploit, and against the TOS. I  don't think so. I think we're using the skills the game designers gave us to run an instance.  We certainly aren't making use of  bugs to gain advantage over other players.
What do you all think? Is this cheating?

-DC
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Well, I don't think it is cheating, but Blizzard might.

Can't find the threads there now (too long ago) but the basic policy is this: If you aren't using a bug, it isn't an exploit until there is a specific warning about it. That said, they considered several content bypassing techniques exploits and warned about them. If you're only having to fight the bosses, they will not be pleased with that.