the only time i see the mantis slightly Overpowered is objective on ragnarok because of no banshees, i honestly see a banshee as a mantis killer, the mantis is NOT Indestructible, like some people think, if you are a decent banshee pilot, and the person in the mantis is a noob( what usually happens) you can take down the mantis without too many problems. and the mantis is not an offensive vehicle, if you drag it near the enemy spawn, you'll just get decimated after like 3 kills.