Probably the best 2D fighter......OK, it ties with Marvel vs. Capcom 2 but otherwise probably the best 2D fighting game I have ever played. I recently purchased Accent Core which just happens to be the first Guilty Gear game I have ever really played XD.
My best character is May who just happens to be the only character I can effectively play as (at least on Maniac mode and against other people)
Besides from all that the storyline and characters are just awesome and the graphics and game play are really well done for a 2D game.
Anywhos post your thoughts, favorite characters, etc. here.