I think he's done fine so far. He links the play quite well, puts a shift in etc.
Can't get on board with people saying it doesn't matter if he doesn't score though. It absolutely does. It's fine that he hasn't scored yet, but just being neat and tidy and getting the odd assist isn't enough for a striker you've paid £25m for. All of the attacking players need to be contributing regularly, both with goals and assists, I don't believe for a second that Silva will be happy if he still hasn't scored after the next couple of home games.
Also find the idea that we're not creating chances to be a bit bizarre. He needs to do a little bIt more to actually get chances in my opinion. You can't just wait for someone to pull a ball back to you at the edge of the 6 yard box to call it a chance, you need to find yourself bits of space where you can get a shot away, go past people either with or without the ball to get yourself through on goal, use your strength to outmuscle defenders and take them out of the game, or get your head on things that you weren't really the favourite for. He needs to improve on that side of his game in my opinion, as he can sometimes seem a bit like a Jelavic type, just excelling at one touch finishing but not likely to get you a goal unless someone lays it on a plate.
Again though, I don't say that to criticise him, he's been pretty good so far.