It's not necessarily about the experience of the specific game. (Although many of the games you name do in fact emulate badly on RetroPie. Galaga, for example,

It's not necessarily about the experience of the specific game. (Although many of the games you name do in fact emulate badly on RetroPie. Galaga, for example, has a glitchy starfield and incorrect sounds.) It's also that the versions of MAMEs shipped are simply buggy, and have some features disabled. If you go digging around in the MAME menus, lots of things are not going to work properly.