Great shooter game for those kids that like PvZ. And it's rated E10+, so those kids who aren't teens yet can play.
However, there is pretty bad content, for example: the engineer zombie, his pants run a little low, so that probably boosted the rating to E10+ immediately. And then there's the "blood", which is really green goo, but it's close to blood. Fortunately, it's very rarely seen, and I've only seen it in a picture (Bonk Choy punching a browncoat, having goo fly out of his arm) and a mini clip (chomper chomping a zombies neck, then head).
AND, if no restrictions are set to chatting with people and them chatting to you, 0-20 people can hear what you are saying with a headset on, and they can talk to you. Fortunately, what they are saying SHOULD be okay because, well, almost everyone who plays this is likely to be a kid. Also fortunately, you can mute players and unmute them anytime.
Other than this, no chatting online gameplay is really fun, because there is pure co-op, garden ops, and team vs team modes. Also, people can revive you (sunflowers do it best) and heal you (sunflower only), and are likely to work with you on doing something like capturing a garden, or vanquish a plant/zombie. So overall. This game has some pretty good co-op.
Oh yeah, also, this game is not really that "scary", because the blood, zombies, plants, basically everything, is animated. Also, this game was made a bit better by replacing "death" or "kill" with "vanquish".
And this game is also really fun, having the experience of being one of your fun PvZ plants or zombies, and using a variety of weapons to beat the other team strategically, and also the co-op is amazing. So I suggest you play this game, but just keep it to the 10+ year olds.
P.S. Weapons are like guns and stuff, but not totally bad.