No, the strategic elements alone make this game at least a 7. I don't know how many times my friends and I had to alter our robots to better match each other's robots. You're constantly developing defences, and counters to whatever you're friends are doing, which makes for really fun battles and an assurance that someone will want a rematch.
I guess I never did play the single player, so perhaps that's why the rating is so low, but as for the multi, it's great fun.