It wasn't bad. It was great to see him, even though he did look a little older, don't we all?
The 'doing nothing' bit was great. Seinfeld does know how to turn a phrase, that's for sure. His bit on the Subway guy was a bit hacky because the guy actually DID lose weight with the low-fat sandwiches, not the triple-fat meatball hoagies, but that didn't mean the jokes weren't funny!
I was wondering how much annoying kid stuff he would do, but when you're a comedian, you've got to pull on life experiences, and having a child certainly rates right up there. His kid stuff was good. He must know that comedians go to that well too often.