No longer possible to suspend disbelief
With much suspension of disbelief it was possible to enjoy the first season. But now, for example, a character who is "running in fear of her life" enters high school, lives in beautiful house with her family, and doesn't even dress down - it's just too far over the limit. The "revelation" at the end of the last series that there's someone even worse than Skylar is lame and predictable. The plot device where someone who is good turns out to be evil and vice versa has now been so overused, it undercuts the believability of all the main characters, and the writing now seems focused on creating a string dramatic moments, rather a coherent plot.