There wasn't a single mention of them being a superteam during their entire 2014-15 campaign and they even lost a key player in David Lee heading into the 2015-16 season, so no they weren't a superteam.
Klay's a great #2 in the Scottie Pippen mold, but there's no period in the modern NBA where a guy like Draymond is even considered an All-Star, let alone a superstar. You go back to the 00s and the guy doesn't even get All-Star consideration when he's competing with the likes of Duncan, Garnett, Nowitzki, Webber, etc. in the West. He's a great role player--that's it. You can't be a superteam with just two star players.
That 2nd round series when the Blazers were about to tie the series 2-2 and were blowing the Warriors out in Game 4, until Steph came back from his injury and produced that legendary performance revealed just how ordinary the Warriors were without him.
Steph deserves full credit for their run that season.