Since MAME/arcade just became available lets hear some of the favorites you have been playing. Metal Slug has been a big one for me.

I'm very partial to the KoF series, though I like most SNK games. My favorite KoFs available on MAME are probably in the range of 2001-2003 all for different reasons on each.

I do like Metal Slug as well but then I played Demon Front while game testing and it's like an even more interesting looking Metal Slug. I'm definitely gonna play that game more when I have more time.

I also really love the Power Instinct series, particularly Matrimelee because that entry plays more like a KoF game, making it more fun.

There's also Samurai Shodown 5, The Last Blade 2, and Garou: Mark of the Wolves which are all great games.

And on the Capcom side of things, we can't forget games like the Dungeons and Dragons games (which are excellent beat-em-ups) or Super Gem Fighters Mini Mix (which is just a goofy fighter)

Other neat games that I wouldn't quite say are my FAVORITES but still really fun are:

2020 Baseball
Baseball Stars Professional
Ninja Baseball Bat Man
Super Dodgeball (the Neo-Geo version)
Marvel vs. Capcom and similar
The X-Men beat-em-up (forgot the title)
The Simpsons Arcade game
TMNT

and... there are certainly others but I can't think of them right now... :x

The Tekken games rule over everything else for me. <3

But there are plenty of other games that I've enjoyed so far, such as Marvel vs Capcom, Metal Slug, and Ghosts N Goblins (which so far isn't nearly as frustrating as the NES version).

Mr doe's castle
mvc2
dark stalkers

I am playing Turbo by Sega now and its fun

I not sure this is a name game but I believe it is and it's my favorite game of name it's called soul calibur it's genre is fighting I recommend playing it since its pretty rare for me to like fighting games 

Galaga
Galaxian
Aerofighters
Indy 500

Final Fight, Cadillacs and Dinosaurs, Marvel vs. Capcom, Golden Axe I, Golden Axe: Revenge of Death Adder, The Simpsons, X-Men, Revolution X, and Knights of the Round

Lots of Pac-Man MAME games, Galaga, Mappy, Xevious, and lots of other Namco classics are my favorites.

I love a lot of Konami's arcade games. My main favorites are Contra and Gradius.

Alien vs Predator, Battletoads, The Simpsons, X-Men, D&D Mystara, Knights of The Round, Darkstalkers, Tekken, Space Harrier, Dragon's Lair, Golden Axe Death Adder, Metal Slug, Samurai Shodown