It should have been 2010 - Germany really played the best football, and could have beaten Spain (unlike the 2008 Euro final, when Spain was definitely better, and had played superbly throughout the whole competition). Most likely, we will have to wait for the next tournament hosted by Italy ..
I do think the quality of the German team is beyond it's ca. 2011 peak now. Certainly the attractiveness of their play is as well.
Do you mean it is above the previous peak or do you just mean to say they peaked in 2011 and are now in decline?