The only DS games that I consider "must play" are the two castlevanias. How well do those emulate now? The last time I tried it (dawn of sorrow), I played it on desume, and it could draw the backrounds and the sprites, but it ran at about 1 FPS, had big black boxes over the sprites, and no foreground or decorations showing. I managed to get past the intro segment (something in a street), but then once it actually got inside dracula's castle all that was onscreen was black.