I've been surprised with some of the weak play of European teams (Italy, France, England, and Spain early on) as two of those teams were in the finals of the 2006 World Cup, and two other European teams (Germany and Portugal) finished 3rd and 4th.
I'm equally surprised with the good play of the South American countries. We all knew that Brazil and Argentina were good, but Uruguay, Paraguay, and Chile have pleasantly surprised me. There are only 5 South American countries in this World Cup, and they are all currently winning their groups. Uruguay is atop group A, Argentina atop group B, Paraguay atop group F, Brazil atop group G, and Chile atop group H.