He made a mistake against City and he had to be more cautious yesterday with his challenges, but he typically does better (on that front) than we saw in these two games. Some people here talk as if he is sent off 5 times a year, which is not the case. In fact, the red card against City was his first this season.
In comparison to other consistent midfielders:
Fellaini: 8 Yellow, 1 Red
Herrera: 14 Yellow, 2 Red
Pogba: 10 Yellow, 0 Red
So again, the perception that he is a red card in the making (while looked true in parts of the game yesterday) is not supported by the data. He may have played less than these two, but he is still not worse when it comes to yellow and red cards when you take into account the amount of time that has played. Against Sunderland, Chelsea, Burnley and Anderlecht he didn't look like a red card that is about to happen. Even against City, he had no yellow cards until late in the game. And so, I think that a little more fairness would be nice.
With respect to rating, 5.5-6 or so sounds about right. In fact, I personally gave him 6.