One thing that would make retropie awesome is a port of the N64 game Goldeneye. I think there would be a lot of support for this title and the N64 emulator is glitchy when I try to run it. Honestly I don’t really care too much about the rest of the N64 titles (maybe perfect dark is an exception). But to me it would make sense to offer goldeneye as a port like quake as I feel it was the most epic N64 game ever made.
There were a couple of half-baked mods in Quake and the original Half-Life (for the Dreamcast of all things) and while the guys over at ShootersForever have come a long way understanding what’s going on with the game I really doubt there’ll ever be a port as such. Given the nature of N64 hardware emulation for it is likely to say in the “just good enough” bracket also – but goldeneye does run on the Pi 2 and a custom control scheme makes it very playable!