The single factor making Manchester United the favorite to win the league this year is their defense. Manchester United the league's best team defensively. I'm at a loss for words when it comes to describing Martinez. His addition to the team has boosted confidence. He and Varane make an amazing team. Manchester United's defensive line has been lacking this for a long time. Another Vidic, this one diminutive but powerful. I'm thrilled for him and I hope he keeps performing well.
I don't really agree with saying Manchester United is one of the best defensively because looking at them now they are actually weak in their defence.
Seeing how many goals they have conceded is definitely proof because they have even conceded 16 goals from 12 matches and if you look at the goal ratio it is still better Brighton, West ham and even Newcastle United so there is no clear reason why you say they are good enough on the defensive line.