most of these are worth owning:

MUA2 is more enjoyable to me, but that might just be because of how much I played teh first one. I may have gotten so tired of it that anythign fresh seems better.

Ze list:
Rockband
Rockband 2
Guitar Hero II
Guitar Hero III
Guitar Hero Aerosmith
Guitar Hero World Tour
Rock Revoloution
Gears of War
Gears of War 2
Alone in the Dark
Dynasty Warriors 5 Empires
Sega Superstar Tennis
Dynasty Warriors Gundam
Ninety Nine Nights
Pure
The Incredible Hulk
Dark Sector
Devil May Cry 4
The Outfit
Bullet Witch
Samurai Warriors 2 Eternal Sonata
Virtua Fighter 5
Rumble Roses XXX
Mirrors Edge
50 Cent: Blood On The Sand
Left 4 Dead
Earth Defense Force
Crackdown
Resident Evil 5
Just Cause
Dead or Alive 4
Quake 4
Army of Two
Soulcalibur IV
Perfect Dark Zero
Eat Lead: The Return of Matt Hazard
Marvel Ultimate Alliance
Lost Planet
Halo 3
Street Fighter IV
Sneak King
Smackdown Vs. Raw 07
Condemned
Sonic the Hedgehog

After playing Gears 2, I simply CANNOT sit down and play Gears 1. Rock Revoloution is pure shit and I only own it because that whole "konami made guitar hero before guitar hero existed" thing had me curious. AITD kinda sucks, bit considering you can get it for twelve bucks at gamestop, coupled with one of those zany buy two get one free sales, it's worth checking out. the arcade game isn't in the case, it's actually Sega Superstars Tennis, but that sucks anyway. DW Gundam is really great if you are a huge gundam mark like I am, other than that there are better DW type of games, like Ninety Nine Nights and Samurai Warriors 2. The game you are thinking of is actually called Warriors Orochi, and it's a Dynasty Warriors/Samurai Warriors crossover game. Eternal Sonata is fantastic musically and graphically, but it's very lighthearted and will ahve you rolling your eyes alot, plus it's easy. I love it to death, but it's probably below par in the gameplay if you're one of those people that jerks off to FF Tactics or something. Also, there's a PS3 version with extra stuff. Rumble Roses is totally over the top and will amke your friends lose respect for you, but it's a better wrestling game IMO than the current WWE games. It's more arcadey like the earlier smackdown games and less simulation like smackdown vs madden 07. mirrors edge is a must try and 50 cent BOTS gets a bad rap and I'm sure you'll roll your eyes and say "to hell with that" but I highly recommend renting it. It's surprisingly fun. Earth Defense Force is a budget title through and through, but I find that I play it more than some of the 60 dollar games that I own. I've bought multiple games since getting it, and I always come back to it eventually. It's cheesy but so loveable. If I ever make a videogame, I want my first project to be a remake of this one. crackdown is lots of fun, especially when you level up a tad. RE5 is my obsession honestly, but then again I'm a RE junkie altogether. Just cause is pretty much Grand Theft Auto in Cuba and you have a parachute and can jump from speeding cars onto the roof of other speeding cars and hijack trucks. Not too shabby for ten bucks. Got it free when I bought AITD and Rumble Roses. Quake 4 is a decent time waster, and much more entertainign than Army of Two, which actually pissed me off. Bad controls, steep learning curve, too much reliability on co-op is really frustrating when coupled with a partner who is struggling with that learning curve. Fuck Yoda, it's the REST of SCIV that's worth the merit. I am legitimately the only human being on the planet that has anythign good to say about PDZ, and that's a shame. I recommend it. I cannot understand how a human being can consider themselves a videogame enthusiast and hate halo and street fighter. sonic the hedgehog is the worst game that I own, and that's saying alot considering I own sneak king.

on the subject of MUA2...

I don't mind the character roster being shortened honestly. in the first game there were a ton of cahracters that I had no interest in playing as and really didn't have any reason to try them out because they were all too similar. it seems like in the second game they spent more time trying to make everyone feel different enough to warrant experimentation. I can tell you in good faith that unlocking all of the character specific costumes and boosts felt like much less of a chore than unlocking all of the costumes in the first game. It was fun trying new strategies with different characters, whereas in the first game you pretty much learned how to take down an enemy, and then repeated that with whatever character you swapped out.

extraction points are gone. you can now save your game and swap out characters on your team at any time now, so there's less of a penalty for experimenting and fucking up. it's really encouraged now. They worked to make levelling less of a chore, with smarter auto levelling and the ability to do it from a mini menu while the CPU takes over your character, so you aren't pausing your game every twelve seconds to distribute pips anymore. it's kinda pointless though, as character customization is pretty linear this time around. all characters only have four special attacks, and all passive boosts pretty much have to be levelled equally due to the points system. I feel that's a big step back and is my only real big gripe about the game. I liked having the ability in the first game to say "I can either make thor a physical powerhouse and buff up his melee damage, crutial rate, and put all my pips into his hammer attacks OR I coud dump points into lightning mastery and utilize his hammer throws and lighting strikes to make him a ranged fighter" in MUA2 he's pretty much typecasted is a crowd clearing powerhouse, for example.

oh, I also have ghostbusters, fallout 3, and bionic commando. all three of those are worthwhile.

he's better in MUA2. in every aspect of the character.

hahaha it looks like a sequesl to final fantasy 8!