Honestly I immediately closed my tv when Ronaldo was frustrated and made a foul kicking Curtis Jones, a very bad performance for Manchester United's class.
I am sure he feels very uncomfortable playing with a team that has no solidity and confidence in playing. But you shouldn't close your TV, mate. You cannot see how the drama on the match goes on. 
I don't know the problem but Manchester United's game is so boring it's not creative. Even they are like amateur soccer players.
I agree if they are playing getting worse day after day. The problem may be on their teamwork and their mentality, most of them just play individually and do not focus on the team goal. Even Ronaldo cannot show his best performance and his solidly anymore, I don't know what's wrong with him. I think he and other Man United players don't care about the instructions from the manager.