Allen is decent, not average. Lucas is up in the air since his injury. Might be good by now, looked average coming back from injury though.
The important part for all of them is that they are all capable of performing the job asked of them in midfield. They are a very well integrated unit.
At length, we'll want higher quality in there. Henderson may be doing well, but ideally he shouldn't be able to get a starting berth.
But midfield is not a big concern for me. They delivered eminently last season.