Well to be honest, I've seen a few good ones and a few bad, the only issue is I've never seen any good ones actually make good use of BattleMechs. In all honesty, there are some good ones out there, but they cross the aerospace parts of Battletech with something else. Honestly, though crossing the general universes and using the aero assets is important, when I think Battletech, I thing big stompy BattleMechs, and those I just have not seen done well when clashed with a different system. It really just depends on what you're going for, and who writes it.