MechAssault, MechWarrior, MechSomething, MechAnything. Just make it WELL.
MechAssault 2 was fun but not as fun as the first. They thought too far out of the box. I mean, who really wanted to fly the VTOL and deliver power-ups all game? I felt like I was working at a fast food joint during lunch. "I NEED ENERGY!" "OMG I'M ABOUT TO DIE WHERE IS MY HEALTH?" The needless nerfs to many mechs was frustrating as well.
Don't even get me started on MechWarrior: Online. Game has really disappointed me as a Founder.