Ahh, Plants vs. Zombies. Great game, that. Brilliantly made, and crammed full of humor and personality. Even zombies, who are usually seen as horrifying undead monsters who will eat peoples brains, manage to look comical without being ridiculous, while still being brain-eaters. Also, their expressions are downright priceless when they take a bite of garlic.
The varying mini-games on every 5th level are also quite fun, and break up what could have been a monotonous flow.