OK, from a serious technical standpoint, no.
The GP2X doesn't have hardware 3D processing. Trying to do what the PSP can in software on the GP2X = Very Slow. Beyond Slow.
The GP2X cannot emulate everything. The GBA has a 16.7MHz processor, the GP2X a whopping 200MHz. That's at least 10 times, and we still don't have a good emulator. Why? A ) Time to code, and B ) Performance hit due to emulation.
The SNES still doesn't have 100% speed emulation. Close, very close, but on some it still doesn't work well. Please, use some common sense.
EDIT: Hate graphical emoticons. XD;