Well most of the N64 games I've tried do have problems or don't run at all, (Conkers bad fur day i'm looking at you), but to be honest i'm just happy there is an N64 emulator at all.

Probably the best performing game at the moment is Mario 64 although the Z button isn't best placed for certain jumps.

I've tried a couple of games where characters have two sets of eyes and in Smash Bros. certain characters have none at all! Freaky.

Given time this will become better i'm sure but, curse my hands, my fingers don't take kindly to constant rubbing against a screen and, alas, only 8 stars in I had to have a break from Mario 64 but it is still a much better experience than the D-pad on other emulators.

Haven't tried FPSE yet although I have PSX4Droid and have played Gran Turismo which runs very well although in the heat of battle your finger can stray off the controls. With a decent bluetooth joypad these emulators would eat hours of my day but my fingers come first!