I can't really tell from that post as its all over the place, are you saying he was in a team that was better than him and he was lucky to be in it, in which case you couldn't be more wrong.
He's one of the best fullbacks the league has seen, full stop. He had no pace, he's short, his entire ability to be such a good fullback lay in his outstanding, world class, almost completely unmatched reading of the game. He has an outstanding cross, bettered by only a few other players, played the right wing role, the overlap and was part of a fantastic partnership with Beckham, he's also a downright excellent pundit and its got absolutely nothing to do with how crap all the other pundits around are(for the most part).
He was a little **** on the pitch, as are many players, but he wasn't dirty, he didn't try to injure players, just rile them up, and he loved his home club.
There are a couple of dozen fullbacks in the league today who are rather crap positionally, reading the game, predicting danger and just use pure pace and no other attribute to save their arses, thats what makes Ashley Cole so good, he's actually excellent AND has the pace.
As for biased or not, who cares, why can't he prefer Utd, no one, ever, is unbiased, he doesn't criticise all Liverpool players and scream about how good every Utd player is. When a Utd player has a bad game he'll say it, just maybe not stick the boot in as hard, so what?