I actually liked younger Drizzt the best. The loner/rebel in Menzoberranzan, but not the Hunter yet. Though I dunno, the fights are always better with the Hunter, but Emo just pisses me off a lot, so...
I didn't mind "defender of justice" Drizzt. That side of Drizzt is always very set into his ideals. The first Hunter experience was out of necessity, which I thought made Drizzt absolutely badass.
The second time was basically out of grieving for his friends, which was a direct consequence of the strength of Drizzt's ideals from "defender of justice" Drizzt. He was forced to face the end result of the fact that he will outlive his friends, and that, coupled with the pain of failure, scared him into a state of instinctual survival. I didn't like that as much, because part of the Drizzt I liked was that he was never one to let something like fear affect him so. In essence, Drizzt was pissed at the world and was going on killing spree until 2 elves showed him the error of his ways.
There you have it folks, my wordy words of wisdom on the Hunter...
As to Drizzt simply doubting himself, that just makes him more human. The huge swings like the return of the Hunter didn't work as well with me, but the littler things, like killing drow and such, were just part of character depth and development. And even in regards to the Hunter, this is Salvatore's character, not mine. And it does make him a hell of a lot more relatable.
And oh yea, my new sig kicks ass, don't you agree?