He is still good at what he does. He like many of our players are not playing at their best.
I've always said he would probably thrive with creative midfielders in the centre of the park rather than workhorses like what we have.
Solid midfield duo should be complimented by creative attacking midfielders like Silva, Cazorla, Ozil, Nasri etc. Creative midfielders like Modric, Huddlestone, Xabi Alonso, Xavi, Fabregas etc... Compliment more direct players like Walcott, Navas and Lennon etc. Walcott and Navas have more to his game.
But I maintain, he is a fantastic tool to have in a managers bag. Raw pace, good ethic. If drilled correctly he could absolutely be part of an efficient team
New manager has a job however to understand what he expects from that position. A creative playmaker like Eriksen or a direct winger.