For me the biggest problem is the casting. There were several people (Amber, Jenna, Jerri) who really didn't seem to deserve to be on the show at all - and those are the ones who are still here. Only Rahb (who played a pretty stupid game in Marquesas up until the merge) has stepped up his game. I really don't look forward to weeks and weeks of Amber and Jenna. think how much better it would have been if we had Mike Skupin and Johnny Fairplay. (I hated him, but would have loved to see him and Rob C on the same tribe). They would never have played under the radar!
Rahb is the only one on his tribe who even thinks about strategy. It's amazing how they all just roll over for him.