I sense a nerf for that tank soon.
All the other shooting characters have some sort of weakness: Bill's a big character and has wonky jumping mechanics, Megaman can't jump very high without that dog and can't shoot up at all, and Samus is also a big character that starts out with a really bad weapon.
But that tank has a jetpack, the ability to shoot sideways straight up and diagonal, amazing underwater handling, homing missiles, and it can climb walls. Holy hell, it's fun to play but so overpowered.