banjo kazooie is a pretty interesting concept, but the gameplay is somewhat lacking. I would recommend you get it anyway since you can get it in a double pack with viva pinata for under 10 bucks used. I strangly found viva pinata to be a pretty addicting game DX.
I would ask your friend to try versus mode in left 4 dead 2 with you because that is where the game really shines. I found the campaign boring as well, but i can never get enough of versus mode.
Kameo Elements of Power is a very fun action game, though a tad too easy.
If you enjoy fallout, get metro 2033.
Finally splinter cell convictions is worth it to buy now that it has dropped to under $20 on amazon. Great campaign but very short.
For exclusive jrpgs, you have all the ones I've played and more so I can't recommend you one.
