These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Sierra in Season 2, who managed to be on the bottom 2 for the first 2 episodes. Though she managed to improve, the judges felt that she was still not skilled enough, so they axed her at 5th.
Exemplified with Gabby in season 2, who managed to win the whole thing. She actually gave very good performances... that is, when she wasn't zoning out on set, making huge mistakes and not listening to Tim Sullivan's instructions. As a result, she frequently found herself up for elimination and only staying on because one of her competitors screwed up even worse than she did that week. This may have been why she had such a small role in Saw 3D.
Hypocrite: Jessica in Season 1 felt disdain for the girls who would wear a nude bra for the Director's Cut challenge, but when it was her turn to act, she went fully topless instead.
Lina from Season 1 played it straight by becoming too boastful in her confession.
Michelle, also from Season 1, she basically made herself like an A-list as the weeks went on.
Tai from Season 2.
Screwed by the Network: Due to the fact that the role for season 2 ends up as the last movie in the Saw franchise.
Undesirable Prize: For all the various and complex training that the girls went through, the ultimate prize ended up as... a small role in the Saw movie. Season 2's Gabby West in particular got virtually no lines before her character was splattered, compared to season 1's Tanedra Howard, who was the star of the opening trap and had multiple scenes afterward in both that movie and the next. (Though see Elimination Houdini above.)
The Woobie: Lindsay in season 1, whose anxiety and self-confidence issues served as her main hurdle. During the challenge where the contestants are told to focus on what they hate in order to express anger, Lindsay tells the Confession Cam that she was focusing on herself.