My friend just got ghost squad for the wii and it is pretty sweet.. the downside is their is only 3 missions so it literally takes 20 minutes to beat the game but its fun to play again and again. Especially with the wii zapper!!
I really like it. Then again I got a used copy for $10. Best $10 I've spent on the Wii so far. Sure the missions are short, but it was originally an arcade game. They made those harder, requiring more quarters, yet short enough to beat in one sitting.
Tell him to pick up a second Wiimote, and act like he is two players. It's fun to dual-shoot like that. Also, you unlock funny unforms and guns the more/better you play the levels. There are some funny ones like a giant panda, and some really useful guns. I've beat it a couple times already, and plan on beating it some more.