Hard to pick just 3 favorite DC games, but here goes:
Phantasy Star Online - in my top 5 games of all time. Pretty much perfect in all respects.
Skies of Arcadia - fantastic RPG with unique ship-to-ship battles, a fun story, and just a great game all around. One of my all-time favorite RPGs.
Shenmue 2 - just epic. It fixed some of the annoying bits of the first game, which I still liked. Gorgeous game and a fun story to play through.
[Edit] I can't resist some runners up: Metropolis Street Racer is the last racer I ever got into. It's just a masterpiece. Tons of fun, and better (imho) than any of the billion sequels it spawned. Capcom vs. SNK 2 is one of the greatest fighters ever. Mars Matrix is a super addicting shmup, and the only 'bullet hell' shmup I ever liked. Crazy Taxi - another super fun 'pick up and play' game. The sequel is also a blast. Different Strokes for different folks, but I just hated Sonic Adventure. I tried multiple times over several years to get into it, but it's just a buggy, confusing mess of a game. I liked SA2 a lot better, but that's just me.