I don't think Carrick has been as good as Schneiderlin or Arteta personally. Schneiderlin is 1st for tackles and interception in the league as well as ground covered. Arteta is comfortably 2nd for tackles and interceptions both out of the 3 of them. Arteta also has 92.3% passing accuracy, Carrick 88.1, Schneiderlin 84.7. I think Arteta is underrated. Man United have had a great team contribution this season. Their defence has got 12 goals for them (Ours has got 4) and they've had 19 different players score (we've had 10 different scorers). De Gea has been great at times when their defence has been a shambles as well. And Van Persie's contribution should not be underestimated. He not only has 21 goals in the league but he also has a lot of assists.
Michu only has 3 assists and has been playing a low number of key passes. Van Persie, Suarez and Bale have outscored him and linked with teammates much better. So I don't think Michu should be in personally. Hazard nomination makes sense considering when it was made. He's chipped in with a lot of goals and assists. Right now I'd only nominate Mata as a creative player instead.
Welbeck getting nominated is an even bigger mystery when Schneiderlin qualifies for the young player award and should have been nominated for the main award IMO.