I think the WC commentary is actually pretty good, much better than normal FIFA. Both have improved on what they were a few years ago. Usually after owning the game a couple weeks - you know, once you've heard everything - I used to always turn off the commentary and play music to fill the silence. Now I can actually play with the commentary on, so that's pretty good. Plus, the WC commentary can actually be funny at times, although I'll admit the FIFA commentary is getting a bit stale.
Also, speaking of the WC game, I was messing around with it today and playing Spain v France (me controlling Spain) matches I adjusted France's custom tactics, lowering pressure and aggression. The result was fantastic and I had the best WC matches yet. Much better experience than normal, especially since I'm playing all manual.
If we're pushing for sliders for FIFA 12, defensive pressure and aggression needs to be included fo sho.