I am trying MAME OS X, and I have only 10 games. But MAME OS X seems wanted to show me everything, 99% I am not interested nor installed.

Can I just show the 10 games I have? Just like how iMAME or other MAME works?

Haven't used it in a while, but as far as I remember you can audit your roms folder. After that you should only see the games you have instead of a complete list of all supported roms.

Thanks! It works. Just need to select "Good" tab, rather than "All". But many games missing, like 1941 and all Metal Slugs!

Instead of MAME OSX you could also try the latest SDLMAME with the MAME+ Frontend.

Honestly I am looking for a simple installation experience... like MacMAME. SDLMAME + front end always strikes me as a little difficult.

Soon, there will be Openemu twitter.com/#!/openemu
You could get the source and compile it yourself. I would do it, but I'm on a 32bit Mac with Snow Leopard which isn't supported anymore.