I agree - no really dynamic personalities this year. However, after a few weeks and less people, we'll probably get to know them much better and really be annoyed at a few of them. They have to have some jerks to make it interesting!
I thought the roulette wheel bit in the first week was very dull. That was supposed to be the one that held them up and it seemed to work out to be a better choice, which didn't make a lot of sense.
There are a couple teams, mainly the young couples, that haven't had much air time it seems to me so can't tell really what they are like.