No PC multiplats.
I'll also be mentioning a few console multiplats of which some are superior on the OG Xbox and they'll have a '*' for the sake of knowing which is exclusive, and which is on other consoles. As for the rest, quality exclusives galore.
First off, some collections for the OG Xbox to complement the library, they're cheap as hell and absolutely worth getting:
- Street Fighter Anniversary Collection (arcade perfect ports of Street Fighter III 3rd Strike and Hyper Street Fighter II: The Anniversary Edition)
- Midway Arcade Treasures 3 (notable games Hydro Thunder & San Francisco Rush 2049)
- Taito Legends 2 (notable games Darius Gaiden, Rayforce also known as Galactic Attack, Elevator Action Returns)
Now on to the games:
Otogi: Myth of Demons - an incredibly polished action - hack 'n slash game similar to DMC, gushing with a medieval-fantasy japanese atmosphere. The Okami of action games, basically.
Otogi 2: Immortal Warriors - just more of the same, with more characters to play as, besides the main character in the first game. Both of these games are most definitely worth playing, not just Immortal Warriors, since both have enough differentiations to warrant a playtrough.. or more playtroughs.
Panzer Dragoon Orta - the last game in the unique, atmospheric and brilliant Panzer Dragoon series. Unarguably one of the best rail shooters ever created, featuring a ton of content, alternative paths, combat of such depth that beggs replayability, buttery smooth, satisfying controls, and more.
GunValkyrie - unique game with pretty much the best 3D control scheme i've experienced. Problem is that it's hard to get into because of how unique the controls are. A major requirement is for you is to master the controls (or at least manage the feat of staying in the air for long periods of time), but once you get past that initial hurdle you're in for an amazing, exhilarating experience.
Jet Set Radio Future - a vastly better sequel thanks to the improvements to the camera, controls, balance and difficulty. Future is a beautifully cell shaded sandbox platformer/action game with unique gameplay and awesome music.
Ninja Gaiden Black - one of the holy trinity of action games, this frustratingly orgasmic game needs no introduction. Best in the series, and best played on original hardware. Don't forget to use the right trigger on a almost-constant basis, without it, one might think that the camera is shit.
Shenmue II (NA exclusive) - Not a action sandbox game, never meant to be. The game is a slow paced adventure game, best played wen you just want to relax. But wen you're in that mood.. oh man. The brilliant soundtrack and beautiful artstyle create an engrossing atmosphere, the continuous pace of learning new moves, meeting new interesting characters and unfolding the nature and understandings of martial arts is an experience to behold.
Outrun 2 - ridiculously underrated, somewhat unique arcade racing game dripping with quality on par with F-Zero GX. Tons of content, unlockables, beautiful graphics and absolutely perfect controls/gameplay. Cannot get enough of this game.
Halo 2 - OKAI, i'm cheating just this one time because the PC version was a) a shitty port only released for Windows Vista and b) the console version has exclusive splitscreen with a ton of modes.
*Burnout 3: Takedown - the best arcade racing game ever created on Earth. Vastly better graphics/performance compared to the PS2 version.
*Timesplitters 3: Future Perfect - light years ahead of the more popular Timesplitters 2, this game is a extremely fun, charming, funny and unique first person shooter. Best graphics and controls on the Xbox.
Dead or Alive Ultimate Edition - best in the series, with an unfathomable amount of unlockable costumes for each character.
Dead or Alive 3 - a slightly different combat system combined with CGI endings for all the characters are reasons enough, considering how cheap it is, to get DoA 3 along side DoA Ultimate Edition. Both are fantastic fighting games.
Metal Wolf Chaos - the only japanese import worth a damn, this is a extremely fun mecha game with some really bat shit crazy content. From what i can comprehend, you're an american president riding a huge, powerful mech machine, trying to save the world. Fully english, so no problem getting into it.
*Genma Onimusha - cinematic japanese action - adventure game with beautifully rendered backgrounds and some of the best CGI from the 6th generation. This game is a enhanced port of Onimusha: Warlords(PS2), with better graphics, a ton of aditional exclusive content and gameplay modifications.
*Fatal Frame 2: Director's Cut - Not a big fan of the first one (also on the Xbox), but this one is gold. Very atmospheric japanese horror game with a interesting plot and overall a trully great, memorable experience. This is a enhanced port of Fatal Frame II (PS2) with better graphics, exclusive aditional content, gameplay tweaks and a new ending.
*Guilty Gear X2 Reload - this is my favorite 2D fighting game of all times, so how can i not mention it as a must own? The OG Xbox port is of flawless quality.
Crimson Skies: High Road to Revenge - arcade cinematic flight-combat game set in an alternative 1930s universe. With over 10 playable aircrafts that can be upgraded as you progress, lengthy single player campaign with an actual interesting storyline, quality gameplay, and more.. this one is for keeps.
Rallisport Challenge 2 - arguably to this day the best rally game ever concieved. What's unarguable is that this is a excellent rally game.
Project Gotham Racing 2 - best in the series.
*Soul Calibur II - exclusive character, 720p enabled, and because.. well, it's the best in the series.
*NBA Street Vol. 3 - because if you want one of the best arcade sports games ever made, you can't get much better than this one. Holy shit, there's so much content and fun to be had with this one.
Mechassault - because if you want some non stop, fun as hell, mech action, why the hell not!
Mechassault 2 - more of the same non stop fun as hell mech action!
Buffy the Vampire Slayer - forget the name/TV series. This is a great action game filled with a non stop entertainment factor that'll leave you wanting more.