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Of course I realize i'm just getting opinions. But fire away!
I've always enjoyed two classes in MMO's more than any others. The heavy armored tank. And the range class using rifle, longbow, shortbow, etc.
My first experience with this class was with DAoC before Darkness Falls was added. I loved the scout! The range was intense, and when he crit'd, it was insane damage! But that's not what I really enjoyed about him now that I think about it. I enjoyed the complexity of the stats of the weapon and the arrows. You would have to choose and equip the arrows you think could do the best armor penetration depending on who you had your sights set on. And you could make these arrows and more advance bows. In short, you felt like a true archer, not a machine gun shooter with narrow wooden bullets.
The vanilla version of the WoW hunter was also a lot of fun, and for me it had to do with the complexity of it. There was now pet management (and it wasn't that easy to train a pet) and the crafting and choosing of the ammunition. The introduction of the rifle was a favorite part of that. Having a dwarf with a rifle just felt right, having a dwarf with a bow....seemed wrong!
There's ton more examples, so for all you fellow archers out there, which one is the best for you?