I totally agree! I hate how it ended with Ally and Larry. I heard that before Robert sadly got fired that they were going to end the season with Ally and Larry's wedding, then in the next season we were going to see how they were in married life and possibly they could have had a baby. I would have loved that, but no, he just left and went back to Detroit to be with his son, Sam.
In a way though I'm kind of glad because if he had continued on with the show, he might not have met Susan. So there were definitely great things that came out of it with Robert, but I still agree that Ally and Larry should have had a better ending.