YES YES YES MERTESACKER SCREW CAHILL
and what Lee said. I dont see anyone blaming the board for this shit, yet they have as much to do with this as wenger does.
Trust me, he's not good enough. He's very tall but he's not dominant at all, gets easily shoved by opposing CF...
He's not mobile at all so he can't change directions very easily. Just think what players like Suarez and Aguero who are very tricky will do to him. He'll be torn apart.
Terribly slow and wouldn't fit Arsenal at all because Wenger likes to play a high-line (similar to Barca). Arsenal will be murdered at counter attacks.
Very prone to making mistakes (especially when he's under the slightest pressure) and was one of the main reason why a club of the stature of Werder Bremen were almost relegated.
The reason he was successful at international level was that Germany defended very deep (where his lack of speed and mobility couldn't be exploited) and played on the counter attack. Germany basically played a 4-2-3-1 so there was a lot of protection for the back-four and rarely did any forward run directly at him (he's terrified when this happens because he's terrible 1 on 1). When the opposition can't find any holes, they resort to simpler tactics like hoofing it and this is where he is good.
The only good thing about him is that he's good in the air, possibly useful against Stoke City but IMO, Jones and John Walters would turn him inside out. they've got pace, power as well as PRESENCE
With Vermaleen and his questionable positional sense getting forward recklessly at times, he's gonna be isolated against teams that play 2 up front (4-4-2 are very common in the EPL), you don't want that. Sorry, he's not good enough.
EDIT: Latino heat beating me by 9 minutes... basically a tl;dr version of my post if anyone's too lazy to read lol