Personally, I don't know if Silva is the answer. Nasri is playing really well and should be given longer. Dzeko had too many chances with no end product, but he's actually been decent when dropping back and playing some simple passes. Lamps seems the obvious answer for me; we're making a lot of chances and just need someone to get on the end of them, Frank is always in the best positions. Jovetic has earnt a chance too.
Overall, not a bad half. I'm surprised how attacking Roma have been, cause really, if they score, it doesn't change much. We need to score regardless so.. I think, with the way that first half played out, we can hope for a 1-1 quite realistically. Fingers crossed, and I hope Nando, Nasri, and Milner can keep it up.