Plants vs. Zombies made a great third person shooter. It reminded me of a Battlefield for children: medics, air support, suppressive fire, expansive maps. Maybe children is a bit much, more like lightheaded fun.
The first Garden Warfare was a great foundation. I remember each game mode adding a twist to the tried and true formula. Capture the Flag being a taco, Domination being stores in the map, Payload being a golf course. It was simple fun, unlockables were easy to maintain. Good learning curve too, not too many characters to mess with the meta but enough to be varied.
Who knew a simple phone game can evolve into a third person shooter?