In the Gingerbread world, Dolphin was the first alternate browser that I really liked — and then it came out that the browser was transmitting all URLs visited to its creators.
No matter how good a browser it is, when privacy is violated to that extent, I'll stop using it.
If you are unconcerned about such things, or trust that the problem is fixed, then Dolphin is a good browser that brings many good features to Android. It has its own add-on system and gesture support, and performs quite well.
