If you can't see how good a player Barry Ferguson was then maybe take up another sport.Barry Ferguson is a bit like the FA cup. If you need to continually debate, defend and tell everyone how great it/he is, then it kind of underlines the fact that it/he wasn't really that great.
He made a bad choice in joining Blackburn as Man Utd and Liverpool were heavily linked with him but in saying that more often than not he was Blackburns man of the match most games. Ferguson was a superb player who probably underachieved during his career.