Even with nostalgia goggles on, PlayStation 1 and 2 easily had more good games than SNES and Gameboy Pocket.
SNES has some absolute gems and a fairly deep library of legit good games, but most Gameboy games are barely better than most NES games and rarely hold up to anything even in the next generation of handheld Nintendo games.
Worth considering the size of the console libraries. PS2 was releasing games forever and had a mammoth catalog. By sheer numbers you would expect more gems.