This actually seems to be the case on quite many bands and artists. You see a show and at the moment you think it's fantastic, but afterwards you see some youtube video and notice flaws that you either didn't pick up or they didn't stick out as majorly in the live situation.

However, I also recall you saying pretty soon after the shows that even in person you could hear all the bum notes from Jon. If you really did and enjoyed the shows nonetheless, with good company or not (and not even good company AND being drunk could save me from cringing at Jon's vocals in Tallinn at the actual show), what was so shocking about the recordings then? It wasn't like you were expecting the vocals to be any better on them either, right?