Gardens and Graveyards is awesome. Longer matches, more chaos, more coins, bigger maps. Love it. I was playing Team Vanquish exclusively, but I was getting pissed off with how quickly the matches ended, so i tried G&G, thinking it was horde mode, and then realised it was some funky mix between rush and conquest. Awesome.
I'm really loving this game, it's so damn fun. My only criticism is how damn underpowered the plants are compared to the zombies. I get so many more kills when playing as a zombie, they seem to do so much more damage, and in a shorter amount of time. The soldier, for example, will kill a sunflower much quicker than a sunflower will kill a soldier.