I thought the fights made the stronger and realize what they have and what they want. It helped Christina go chase her dreams of winning a Harper Avery award and helped Meredith see that it is her time to shine not Dereks.
Sorry guys, but Sandra Oh (Christina), was recently on GMA (good morning america) and stated this will be her last season on Grey's. I also hope that she isn't killed off. But it explains why all the tension between her and Meredith.