Mu is awesome, one of my favorites. I especially like the "Mu and More" and "Mu and Much More" decks that have other games you can play in the box. It is a bit fiddly customizing the decks for the different games, but it is amazing how much game is in that one box. Njet was mentioned in another comment, and that is one of my go-to games when playing with non-gamers.

Mu is my favorite trick taking game of all time, but it is difficult enough that I don't get a chance to play it very often.