Yes they overpaid. The problem is everyone in baseball overpays. If McCann can get what he got, Freeman was going to get a lot more. This deal also shouldn't force the Braves to overpay for him when he is getting old like many other teams have done.
If you didn't see it, Chipper had to come rescue Freeman last week after he was stuck out on the road during the storm. Chipper is tweeting about wanting some money for being his chauffeur. There are some funny pics and comments if you want to look up the story. Chipper showed up in full cameo on a 4 wheeler.