I don't think many would argue against Group E being the roughest one--three teams that are top 20 (regardless of FIFA rankings), and poor Ghana to clean up. Going in, Group F didn't seem that tough, but the match tomorrow Brazil v. Australia will be interesting; if Australia shows well, it'll do them a world of good. I don't know about the other groups, though; there seems to be 2 'strong' teams and 2 'weak teams' in every other group, or at least one 'strong' team and 2-3 'average' teams.
Is it just me, or does there seem to be not only more African/Middle Eastern teams than usual, but they aren't half bad? I don't mean to say that they're good...but they're not poor, either. The only one I thought played poorly was Saudi Arabia. But Angola played strong against Mexico and Portugal, Cote d'Ivoire has done ok, and Tunisia and Ghana haven't exactly bellied-up. I haven't seen Togo or Iran play, so I can't comment on them.