Not surprising that Bolivia Redux is ranked so low, pretty much all it was was a cheesy boss fight, and a bunch of cutscenes. They could have had Lara go through another fantastic level and end up with a much better ending than the one they concocted.
Kazakhstan - well, that is a low ranker because everybody hated the bike chase in that one. It must have taken me at least a dozen tries to finally get Lara through the last part and onto the train. I remember right before I did it I had managed to get Lara onto the train and then barely overcorrected on the steering and Lara went over the side - again. I was literally screaming at the computer - "****! **** you, you stupid ****ing game! Who's the ****ing asshole who thought this **** up!"
Other than that, though, Kazakhstan is actually a large level with a lot of stuff to do, not bad in that respect. But the bike scene zeros it for people - that, and the fact that it is set in such a bleak environment.