Tiger Woods 09 (the putting meter in 10 is really lame)
Halo 3, or ODST, as long as you're playing online
Skate and Skate 2, All depends on the kind of skating you want to do
And, I can't believe no one has mentioned Fifa. 10 comes out in like 3 days!
but who cares cause fifa 10 is gonna be insaine +++++ nhl 10 is ballin as fuck