Sky sports article listing positives, negatives and praise for Louis.
http://www1.skysports.com/football/news/11979/9302017/van-gaal-in-quotes
The negatives sound like positives to me for the most part:
"Van Gaal simply didn't want to work with me, he treats players like interchangeable objects." -
Luca Toni, 2006 World Cup winner and former Bayern Munich striker
"Van Gaal hurt me more than anyone else in football." -
Lucio, 2002 World Cup winner sold by Van Gaal at Bayern Munich
"Louis gives his players instructions they need to perform to make the system work. And the system is sacred. All players are equal to Van Gaal, big names do not exist for him, and everyone is subordinate to the team and system, his system." -
Dennis Bergkamp, when seemingly comparing Van Gaal unfavourably to Cruyff and Arsene Wenger
"He must realise that in this club there are other people who are also responsible for sporting matters." -
Christian Nerlinger, former Bayern Munich sporting director
"You wonder whether he has one or two screws loose."
- Johan Cruyff
"I haven't had fun on the pitch once under van Gaal. I had had more than enough of it."
-Franck Ribery
"Van Gaal is the Hitler of the Brazilian players, is arrogant, proud and has a problem. He has no idea of football. His type is sick, he's crazy."
- Giovanni, Brazil international who worked with Van Gaal at Barcelona
"Louis van Gaal has been a very good coach in many clubs but his style is very difficult. He is very tough, people don't like him, but he wins. And one day you don't win - and when you don't win, everybody that is angry with you will come back to you and try to kill you."
- Ferran Soriano, Manchester City chief executive and Van Gaal's vice president at Barcelona