i know, i used to like playing 2d fighters with a d-pad, but lately it just sucks. your thumbs get thrashed and it's not very fluid. so one day while my thumbs were killing me, i started using the analog stick and got the hang of it. then i got a real arcade stick that i'm only OK on(a lot better, i just suck).
i also suspected playing ds on psp would suck badly, and playing on the little analog nub is out of the question. yeah, it sucks!