Yeah, he won things with Liverpool and Blackburn but at Liverpool he inherited a great side and arguably made it a lot weaker, and at Blackburn he had an open chequebook.
Woah, hang on a second. The '88 team Kenny built was arguably one of Liverpool's greatest teams, he hardly made them weaker. In fact it was his departure that started the 20 year rot which has left the club unable to challenge the likes of United any more. He won 3 titles as Liverpool manager, you can't be a bad manager to win the league title. But that was 20 years ago, football has moved on and Dalglish had struggled to adapt.
He did great as temp manager last season but becoming a permanent manager was always going to be a whole different challenge.