What does Giggs being near the end of his career have to do with his non-performance that night? He'd still performed to an unbelievably high standard that season, and at times last season. You don't absolve him of blame because of that - don't make out as though he was on his last legs or something.
You last sentence is apt - to a man, we were just shite.
Carrick creates a rather interesting debate. I've noticed that when he plays well and we, as a team, play well, the majority claim that we didn't play well because of Carrick, but rather because he was made to look a superior player by other, better, players around him. As though he couldn't possibly the man to make us tick and dictate the game for us. Yet as soon as we lose, he's one of the first people that is maligned.
People can't have it both ways - if you refuse to credit him when he makes us tick, don't get on the lad's back when we lose...