I think with the mechs, they can be countered if you have some good cactus players on your team so they never even get near the base. If you see mechs are coordinating, and you only have one or two cactuses, then it's time to switch. This happens in most games, many players don't know their role, and/or fail to switch to a different role to fill a void. I admit, while I'm trying to level up my characters, I've been guilty of that too. But, I've also been in games where based on my character, I knew who to be targeting, and who I'm ineffective with, like when I'm playing as chomper, and see footsoldiers on the roof causing havoc in our base. We may have several peas or corns, but they completely ignore them. Problem then is, if I were to switch to yet another pea on the team, I can't cover the ground threat. My point here is, it's more an unbalanced team of characters and lack of coordination that's the issue, rather than how powerful the mech is.