Physical presence was on display in at least two of the games you mentioned, what makes him good is the eye for a pass, making good runs, understanding of how to link with teammates (even at 17 before he was in the team he just seemed a natural at this) ability to tackle, and potential to be a leader (notice how when Sczezny got injured, he was the one having a chat and giving him a back on the back). In yesterday's game when he was contesting balls with Rooney, you could see a mutual respect there, something Rooney often doesn't show towards our midfield.
I've seen Wilshere in more than four games, since before he made his debut, to probably a dozen untelevised matches, in my opinion he's a good player, if you are prepared to write off a teenager on the basis of two games against the best team in the world (where he outperformed superstars like Fabregas), and two games against the best team in the country (based on results this season), fair enough, I'm sure people could probably find four games this season where the likes of Rooney has 'done nothing' as well.