Doesn't sound good at all. But I'll still probably play around with the 3ds port just for kicks. Dunno why I get a kick out of running things like Windows 95 on my N3DS, even though it doesn't really run well
Edit: Is it extremely difficult to port the current MAME to 3DS? Nevermind playability, but to even get it to a state where it will build with devkitARM seems like too much trouble to me. Then there are differences in hardware access between a .3dsx and installing a .cia.