Agreed. I tried all the PSX emulators on the list and Mednafen is the way to go. The author is actively focused on PSX development which is promising.
I'd recommend RetroArch for SNES (BSnes Balanced core), Genesis (Gens Plus core), and most Nintendo 64 games (Mupen64plus core).
N64 is a special case because you need several emulators and a collection of plugins to get all the games running. 1964Ultrafast, Project64 1.6, Project64 2.1.0.1, Mupen64Plus.
Apparently there's some controversy surrounding RetroArch but I haven't witnessed it personally and my main concern is what works best. Many emulator authors are drama queens so I stay out of it and just play the games.
Between Mess, Mednafen, and RetroArch you can run quite a few consoles. Someone new to HyperSpin should start with the multi emulators and work their way down, replacing some systems with LLE emulators for higher accuracy and compatibility.
