Robben wasn't too happy about going to Bayern back then.
"Robben revealed that it was especially difficult to move to Bavaria given that Bayern Munich were not a top club at the time, having not made a Champions League semi-final appearance in eight years."
"It was a difficult decision, the most difficult one of my career," he explained.
"Bayern were not among the European elite at that moment and it was a step back for me."
https://www.marca.com/en/football/real-madrid/2017/01/02/586a2ff3e5fdea97448b45b3.html
Worked out extremely well for him and Bayern.
Sneijder was sad to leave as well.
"What happened with me is very strange," said Sneijder. "They [Real Madrid] treated me very badly but to tell the truth I would prefer not to talk about it.
"I am going to a great club, of that I have no doubt. I am very sad to leave but that's the way it is."
https://www.theguardian.com/football/2009/aug/27/wesley-sneijder-real-madrid-football-transfer-inter