How did you like Robert Downey Jr's character on "Due Date"?

I personally thought he was a short tempered jerk and a very unlikable character, I've totally felt bad for Zach Galafanakis's character for the abuse, the disrespect and the cruelness he received from Robert Downey Jr's character and I thought Robert Downey Jr's character should have been blessed with what a super nice guy Zach Galafanakis's character was, not many people would have been nearly as nice towards these people that's for sure!