Bradley may have won 12 and 10 because there wasn't much action, but 11 went to Manny. He probably, like you said, won the 8th too. If you want to be generous you could say he won round 1. So that's 3 rounds he won the whole fight. IMO, the only rounds Bradley could have won were the rounds where neither fighter landed much.
At the end of the fight, I thought nothing but that Bradley showed a lot of heart and toughness, but was clearly outclassed. I had no inkling that the fight was even close. At least with Marquez/Pacquiao, you could make an argument either way. With this fight, the judges must have been awarding points to Bradley for a graze of Manny's ear or for every time he was measuring his jab.