No offense, but this really reads like a post from 15 years ago. It's not true anymore for NES and SNES and has not been for years. Look at mesen and bsnes -- 1

No offense, but this really reads like a post from 15 years ago. It's not true anymore for NES and SNES and has not been for years. Look at mesen and bsnes -- 100% compatibility, indistinguishable from real hardware on every released game. Your post is still accurate if you're talking about newer hardware like the Wii or PS2. Even N64 emulation is still kind of sketchy 25 years later due to the weird exoticity of that system.