Simon Pegg is a good actor, the problem is that Scotty just isn't written right. He's too comedic, even Pegg has said he wants the character to be more serious than he was in XI. Aside from Trek V, I didn't think the other movies did a bad job with him. Relics has some good character moments, though seeing him act the bumbling old man thinking he's helpful when he's actually getting in the way was a diservice to the character. Continuity is gravy to the storytelling meal. Yeah, it's great when it's there, but a great story will stand on its own quality, even if there's no continuity.