PvZ is the epitome of fun tower defense games. The production design is excellent, the soundtrack is charming, and it's just terribly, terribly addictive. My day is no longer complete unless I've heard the sound of peas clunking against metal.
A sort of tower-defense game - wonderfully fun to play. I initially disliked the concept, but the excellent design and game play won me over. Probably the best game design I've seen in a while. Cons: Stupid and childish premise of "plants vs. zombies" that is hard to discuss in a mature way.