Another interesting feature of the game is an emphasis on 'tribal' synergies; for instance there are Bean plants that can synergize with other Bean plants, Mushrooms that do the same, and on the Zombie side you have Zombies that get buffed when a card with the Gravestone keyword is played and so on. All these synergies (and there are many more than the ones I've mentioned here) offer many deckbuilding opportunities, and I can see that when players start figuring out the various cards, we'll see some very tight and effective decks appear. Add to that the numerous Heroes on each side of the Zombie/Plant divide, which work well with specific kinds of minions, and you can see how PvZ Heroes isn't either a cash grab nor a simplistic CGG.
One word of warning: as far as I can see (and as far as people can see), there's no signing in and no Game Center support at the moment. That means you probably won't be able to transfer your collection and progress to another device. I'm guessing that will change in the future, but keep that in mind for now.
The game is in soft launch, and if you want to check it out, you can on how to download soft launched games and then get the game from the link below. So, if you like CCGs and enjoy the Plants Vs Zombies art and shenanigans, you should probably give this game a try.
New Zealand App Store Link: