Ahh, my opinion, Mu at 2 stars is not a good ninja to use specially on your level .. But if you only want to use it for TI, SA or Wanted Missions then you may go ahead and have fun with him .. But when it comes to PvPs like GNW, SWB or even defending your Convoy from Plunder .. He's not gonna do anything, specially when his clone dies, his Mystery's power drops ..