Yeah, there's only so many scoreless innings a guy can throw before you just say "ugh, enough with this".
Seriously though, he struggled for one inning but got out of it, and in the other innings he's breezed. He's at 60 pitches through five, and he's shaved almost a full run off of his ERA in just this one start. I'd consider this pretty good. I think we all knew he wasn't a 6 ERA guy, and I'm pretty sure we all also know that it's still early enough in the season that you can knock a run off of your ERA with a single good start.