To me, he's a victim of Martinez:
His greatest asset, his energy and pressing, is made redundant when the one thing we sorely lack as a team is pressing.
However, he does need to work on getting forward, since his play in the final third leaves a lot to be desired. If he plays as a midfield 3 with a defensive player (Barry) and an attacking one (Barkley) then he needs to add a little bit of creativity and possibly a better shot from the edge of the box.
Thought he played well in the second half of the semi like, when theteam ahs energy and are pressing, he often wins the midfield battles.