Yeah, punk was a bit of a rejection of the polish of the big bands of the time. In a sense, the "horrible" was sort of the point. And for the shock value. But did that really mean they were horrible? Probably everyone kind of sucks at first. But it's hard not to improve your skills once you have got to a point where you have done a certain number of shows because you created a sustainable cash flow to support it.

There was an interview with Joey (maybe in the greatest hits liner notes?) where he said at the beginning they were trying to cover their favorite songs from the 50s and 60s but they couldn't figure them out. So they wrote their own that were easy (my word) enough to play.

Imo they were terrible musicians but a world class band.