I've been somewhat disappointed by him. No matter what any one says, there is no way this guy was worth £30 million. He's got a decent touch, a decent pass, and is pretty good at breaking up attacks before they happen, but he gives very little protection to the back four and is very lightweight and I don't think I've noted a single outstanding attribute.
I know you've all heard this before but "we should never have got rid of Barry".
However, I think Ferna could be a very good player in the BPL once he's settled in a little bit, but for now, why not play Milner just in front of the back four? For me he's like Barry V:2.0. He's effort can't be faulted, his tackling is sublime, he'd cover the back four, has strength and pace (well, more than Barry) and his passing is sublime.
For me the Midfield should be:
CDM: Milner
RM: Navas
LM: Silva
CAM: Yaya Toure
The other advantage of this is pushing Yaya into a more effective attacking position.