I mean, to be fair, they haven't ruined Marvel at all, and the Star Wars universe was already straight trash after the prequels.
At least Disney gave us the first good Star Wars movie since Return of the Jedi with Rogue One. The rest have been underwhelming, but one good Star Wars movie is more than Lucas has given us since the eighties. It's not like he was righting the ship and Disney swooped in and crashed it. George sank the Titanic. Disney just raised it from the depths, got one good film out of it, and promptly sank it again.