I really like Marquez... the guy was beyond money for Mexico in the World Cup, and if properly used can be a world class defender and be the leader they desperately require. Barca's foolishness in playing him out of position could be our advantage. He instantly adds credibility to the backline, and can definitely apprentice our younger defensive talents, like Criscito and Chiellini... (as well as Barzagli and Molinaro if they arrive). He blows everyone else we have out of the water, with only Grygera and Chiellini coming close. I hope he wants the opportunity to be the #1 defender at a top club and takes on the challenge.
We can't reasonably expect a whole lot better right now, especially for that price. Was he not also awarded top defender in Ligue 1, not too long ago?
Lets also not forget defenders tend to get exposed a lot more in spanish league... Zambrotta and Cannavaro sure don't look as good with their respective teams as they did with Juve.
I expect the big money will be spent on a Liverpool midfielder or two.