A failure throughout his career you say?
Let's just see if he's won anything...
Winners medals as Aberdeen player:
European Cup Winners Cup 1982–83
European Super Cup 1983–84
Scottish Premier League 1979–80, 1983–84, 1984–85
Scottish Cup 1981–82, 1982–83, 1983–84, 1985–86, 1989–90
Scottish League Cup 1985–86, 1989–90
3rd most capped Scotland player of all time.
Management honours:
Motherwell 1994–1998
Scottish Premier Division runners-up (1): 1994–95
Hibernian 1998–2001
Scottish First Division winners (1): 1998–99
Scottish Cup runners-up (1): 2001
Rangers 2001–2006
Scottish Premier League winners (2): 2002–03, 2004–05
Scottish Premier League runners-up (2): 2001–02, 2003–04
Scottish Cup winners (2): 2002, 2003
Scottish League Cup winners (3): 2002, 2003, 2005
Birmingham City 2007–2011
Football League Championship runners-up (1): 2008–09
Football League Cup winners (1): 2010-11
A more accurate assessment would be that he's a winner throughout his career who has had a couple of crap seasons. I'm not exactly overjoyed about the appointment, but "a failure throughout his career"? Hmmm...