NBA2k6
Graphics - WOW. Amazing player textures, animations. Cloth physics. Can you say sweat simulation? Even the jersey's get wet from player sweat. All around amazing job.
Sound - Adequate.
Gameplay -I didn't play this on Xbox, but the gameplay is solid. A few quirks here and there.
Overall - If you like basketball, or like basketball video games and need a game to show the system off, this one is for you.
Verdict - Buy

Need for Speed: Most Wanted
Graphics- This title has come a long way. It looks really polished, the HDR lighting is amazing. The game is very stylized that uses a mix of real video and in game graphics...and it's tough to see the line between.
Sound - Great sound on the cars. The destruction sounds are lacking oomph though. Police radio chatter is great. Soundtrack is mostly rap, but fits the motif.
Gameplay -The challenge modes are a blast. Campaign is interesting. The cars all handle fairly realistically. Running away from cops is just a blast, especially when you get to drop a 30 foot donut on them!
Overall - Good fun game. A little closer to sim in car handling then I would have liked, but lots of fun none the less.
Verdict - Buy

From the "Live Arcade Titles" he liked Hexic HD (free), Geometry Wars Evolved and Joust.