So, Tower Defense walks into a 2-D bar and he orders an old copy of Zombies Ate My Neighbors. Grows on you, indeed.
Unfortunately, you'd think that after putting so much effort into the gameplay, they'd respect their design a little more. The fact that this game is limited to 800x600 isn't just outdated, it's embarrassing. People will likely excuse this because they only hold PvZ to a "casual gaming" standard. But the truth is that it's blatant omissions like this that could be so easily addressed that hold PopCap down as the king of "casual gaming" when they could be making general classics. There's a point in the game where you take control of the zombies and have to fight against plants...multiplayer anyone?
Bottom line, it's gameplay over gloss any day of the week and PvZ has it in spades. Still, given that you can't help but wish they'd just have added that extra bit of gloss.