There are subtle bugs and issues with timing, but the worst, for me, is that the games are not accurate. I play a lot of 80s games on original hardware, but also (when i'm not at home) on my laptop/ipad/android in emulation. Games I have been playing for almost 30 years are locked solid in my mind; every enemy, path, timing has been set in my brain. I can play those games blindly on original hardware. But not on emulators. For people playing these kind of things for the first time this is not an issue; for me it's not being true to the original. The quirks which were in there are supposed to be in there. Horizontal shooters which had visual/audio issues in the original game because the end boss was actually too big for the poor Z80 + VDP to do fast enough, is now suddenly smooth in the emulator in case you lose the edge of attacking it when the computer is in pain. More fun or not is not the issue here; correct emulation is important to preserve all millions upon millions of carefully crafted assembler instructions on the platform of choice. Until we have this working well, I'll keep buying old computers for peanuts just to make sure.
