Great Exclusives:
-Arx Fatalis - Ultima: Underworld inspired action-RPG.
-Crimson Skies: High Road to Revenge - Awesome airplane game set in the 1930s. It's a bit open-ended and you can upgrade planes and unlock new planes as you move forward in your questline. Great looking graphics, to boot.
-Dungeons & Dragon: Heroes - Great little Baldur's Gate: Dark Alliance clone.
-Elder Scrolls III: Morrowind - The 3rd Elder Scrolls game and the single best RPG of that generation.
-Halo 1 & 2 - Must-haves if you own an Xbox. Great multiplayer, and blockbuster-movie-eque campaign storylines.
-Jade Empire - Very unique action-RPG set in ancient China that centers around martial arts and mystical arts and has a cool moral/choice system.
-MechAssault 1 & 2 - Best mech-games of that generation, IMO. Less simulator-based, more action-based than other mech games.
-Panzer Dragoon Orta - A sequel to the Sega Saturn series. Gorgeous graphics and a great soundtrack mix to make a very relaxing game, actually.
Great Multiplatform Games:
-Baldur's Gate: Dark Alliance 1 & 2
-Burnout 1-3
-Capcom Classics Collection 1 & 2
-Incredible Hulk: Ultimate Destruction
-Marvel: Ultimate Alliance
-Marvel vs. Capcom 2
-Mega Man Anniversary Collection
-Sonic Mega Collection Plus
-Spider-Man 1 & 2
-Tony Hawk's Underground 1 & 2
-X-Men Legends 1 & 2