Yes there are some fantastic midfielders around and I would certainly take Essien, Gerrard, Fabregas... you're getting ridiculous naming Flamini and Hleb to be fair, Barry isn't in the class of any of our midfielders, Alonso massively overrated. But the stats don't lie, over a season our midfield has been fantastic and our standout midfielders have been Anderson and Carrick.
Alonso isn't "massively overated" at all, you admit yourself he was excellent in his first season with us but for some reason you don't rate him at all since then. In 05/06 he formed an excellent partnership with Sissoko and played a big part in what was the best midfield in the league that season.
In the next 12-18 month most pool fans will admit his form dropped which is what you seem to pick up on most, but he was still once of the best centre midfielders around despite struggling with injuries.
Without him this year we probably would have struggled to make 4th place and we certainly wouldn't have done as well as we did in CL, at Anfield he played Arsenal off the park and he was our star performer versus Chelsea.
He's got everything you would want in a centre midfieler bar goal-scoring abilty, but he doesn't play that far up the pitch in the first place. On his day there's no better long passer in football and he's defensively good enough to cope with just about anybody. There's certainly no United players I'd take in place of him.