Depends on what kind of midfielder you are looking for. Cazorla although more of an offensive one is a good call as he spent most of his season as no8, doing surprisingly well in defending, playmaking from deeper role. Schneiderlin has done reasonably well too but his contribution is rather defensive, he and Waynama is the reason why they conceded as few as 22 goals. Matic and Fabregas were the best midfielders in the first half of the season but they faded a little, they were palying all the time 4 competitions, Fabregas creativity-wise(4+22 in all comps) and Matic breaking the play, similar to Schneiderlin. But their team was working really well all season.I would like to hear (from someone who watches EPL a lot) who are the best midfielders in the league right now. Unfortunately I watch only United this season.
Checked on Ramsey too, at first I though that he spent most of the year injured but he has 8+7 in 32 games which is great numbers even not as good as last season. If there is an all-round player similar to Herrera I'd say it's him from the lot. The rest is either too offensive or too defensive or they didn't make my list because they didn't perform this season. Well Henderson had a good season too but he's cnut and got battered at Anfield.
I'd say Herrera is the best all-round midfielder in the league but he didn't play enough games. And played in completely new and forming team who struggle to get going for the most time of the season..
Can't wait to see him next full season, what he can do in better playing team, hope he can stay prolific - it's a pleasant surprise for me, never thought he has so many goals in him..