Yeah every fight so far has been pretty terrible. Kinda bad when the fat guy (Nelson) and the street fighter (Kimbo) have had the best cardio so far.
I don't judge fighters based on TUF though, because the majority of them aren't in shape when they get on the show and then they only have a couple days to a maximum of a week to prepare for each fight (First week there's 2 fights per day, every other day). I wait until the finale and so on because that's when you can see how they really are as fighters (with proper training camps inbetween fights).