Anything about 80% will be a success, since RTSes haven't had a great streak of playability for the past 15 years.
The best console RTSes I have played are:
Herzog Zwei (the founder of the modern RTS as well as the best controlling console RTS. Ever)
Kingdom Under Fire: The Crusaders
Lord of the Rings: Battle for Middle Earth 2
Everything else has been sub-par, IMO. C&C 3 was a step back given how well LOTR: BFME2 was.
Back from the dead, I'm afraid.