You know he came back to to put over Punk right? His wins or loses mean nothing for his legacy maybe for you but for most don't think that.
He will be back and I fear for Chael Sonnen when he goes to Brazil.
He sucked at putting Punk over.
Putting Punk over doesn't mean a thing if you're not built up as a threat to Punk.
Jericho never was.
Jericho put Heath Slater over in NXT. What did that do for Heath Slater? Did it mean anything?
Jericho put Evan Bourne over in a string of unhyped matches on RAW? What did that do for Evan Bourne? Did it mean anything?
NO.
If you want a textbook example of how to come back and put a guy over, look at Lance Storm's feud with Mike Bennett in Ring of Honor.
That is how you come back to put a guy over and have it MEAN something.
They did a table match at extreme rules and Cody got thrown into one so they are PG. Also, some people actually liked the Jerico and Punk feud and also again he came back to put over Punk.
His matches with Punk were very good.
They were OK. Given the stature of the two men involved, I'd argue they were disappointing and didn't live up to expectations. The fact that Daniel Bryan vs. CM Punk have easily put every Punk/Y2J match to shame without trying at every opportunity should tell you plenty.