Arknor, the difference this year though, is that they have a top line driver piloting their car. This is something which they didnt have last year.
[I questioned within the first few races of MSc's return that he is no longer capable of winning. People jumped down my throat for this comment. 3 years, 0 wins and being beaten by his team-mate every year in the WDC, I was proved right.]
One thing which Merc staff keep saying is that they aren't going for the title this year. The 2014 WDC is what they seem to be pinning their hopes on, so I wouldn't expect great things from them in 2013. Maybe 1-2 wins, if they are lucky?
Of course, when the season starts, anything can happen. And now that Hamilton is out of McLaren, with a new challenge, we may see some heroics this year.
Personally, I feel that (like MSC, Alonso and Vettel), Hamilton NEEDS the entire team based around him. He needs to be made to feel special. The darling of the team. Under these circumstances, he delivers his best performance. Will he get this backing at Merc - I'm not sure. A German team, with a German driver (Rosberg)...why would they back Hamilton over Rosberg?