i'd say SupCom.
i almost never play chess (no one to play against)
i've only played Medievil Total War, and i could never be bothered to see it through
Warcraft, AoE, starcraft, DoW, Sins of a Solar Empire etc etc i just turtle up, turtle up, turtle up, and the EXPLODE outwards from my base in an unstoppable wave of fully upgraded super units and cannon fodder, and roll over all things in my path
Sup Com is just too damn big for that to work. defenses have to be placed where they'll be most effective, defense armies need running around inside your lines, and you have to manage an economy worse that ours is all the damn time. seriously, building power crashes your mass, buildin mass generators crashes your power. building anything else crashes both.
i'ts all balanced on a knife edge, and to cap it all off, the AI just keep on coming for you