Honestly, Nomura is one of the few good things Square still has going for them. He's the only one who releases titles that are consistantly good, and his art style, while familiar, is responsible for some extremely memorable character designs. His biggest flaw is he sucks at multitasking, and fails to give consistant updates on his titles, but he hasn't ruined Square.
His decisions like yanking the Kingdom Hearts team to work on a Final Fantasy game was stupid. I don't remember who use to run square but I wish Nomura would of stayed with Kingdom Hearts only.