I've noticed that with a few excpetions, the weapons in the game aren't so bad balance-wise. However, frame parts are really badly balanced. Personally, I think that the Lemur arms, while not nearly as bad as Lemur2, are still too good. I mean, come on, what reason is there to equip heavy-arms when the only improvement is usually AP (and not very much) and maybe another few points of shell defense? I think without it there wouldn't just be that one arm on many designs, but it's probably too late in the lifecycle of the game to actually matter. It's so strange that From can't seem to change obviously messed stats.