Sounds fun!
Some advice: The Ares's power is not actually that much more than traditional assault 'mechs, so don't expect it to crush enemies just by looking at them. It'll draw a lot more firepower than it'll dish out, so use it as a decoy. Drive it defensively and use cover whenever possible(difficult due to the great height, I know) to keep it alive as long as you can, and use that time to maneuver your faster stuff to hit them from the flanks or rear. Those Doloires and Lament are the real firepower of your force, treat them accordingly. Swing them around, and when everyone's still pointed at the Ares, smash them from the other side. >:D