Many a time Mourinho has gone to a title rival team and played for a draw then been hailed a genius.
Today's game shown me a few things;
1st - Pellegrini will grind results out. We went to Old Trafford knowing a point would return us to the top of the league and we were missing our two best players. The minute they brought Fellaini on he did the right thing by shoring us up.
2nd - We can never again play Yaya in the number 10 role. He was dreadful today as he was against Spurs.
3rd - They are the games United need to win. At home against a weakened title challenger who are there for the taking. Make no mistake, this was a much better result for us than them.
The only negative I would point out was Pellegrini's starting 11. I think he gave them far too much respect and should have started Navas with KDB behind the striker. We offered very little movement and were easy to play against. That said, you take Ozil and Sanchez out of Arsenal and they would struggle too.
All in all a good result for us.