I'm RideOrDie with team #LeaveSLKRalone.
Of course he can beat a lot of teams. He's a GL.
Most players (or guilds, in TW) should just match the correct offence against SLKR on defense and get an easy win. Yes, you have to expend a powerful team to do it, but it's an easy win. If you don't have the correct offensive squad and get stuck behind his ult after you kill everyone else, you let the battle time out and when he comes back solo he's far easier to beat than LordVader solo.
I am not someone who thinks he needs a lifter unit, but I can say that even if he got a lifter unit he still would not be OP.