Noobish Questions (updated frequently)

[MongoJerry]

So I should probably stop making new threads with each of my questions, so I made this one with the all-purpose title I can put follow ups in later.
1) What's the math for how spirit interacts with health/mana regen? Would a human warlock regening both pools be more mana efficient than a gnomish warlock's int?

Neglecting a few exceptions, generally health does not regen due to spirit while in combat. (Waiting for the list of exceptions to come pouring out...)

4) Are shadow priests fun? What's the most fun class, in your opinion?

Yeah, shadow priests are a lot of fun. You get a lot of flack at the high levels, because people think priests can only heal and generally hate it when priests dps instead of healing them, but hey, if they want healing whenever they want it, they should have played a healer themselves, right?

Basically every class is fun, and it depends on your tastes and temperment. If you want something fun and different, you might look into playing a druid, especially a feral druid.