The only mech that's underpowered is Northstar imo. I haven't used him much to really test him out but he seems quite difficult to be dominant with, while you can be dominant with every other Titan. But who seriously thinks Ronin is weak? I switched to him just to try him out (I want to get everything to gen. 2 to get a better understanding of the game) and I've stuck with him recently. His weaknesses lie in his lack of versatility, and the pilot's ability to be patient. (edited after first reply) Edit: Just started using Northstar, and this is not underpowered. While it is a support mech for sure, it can do incredible amounts of damage if used properly.