There's two that come to mind:
I gave up on it near the end of the first season. What mostly irked me about it was how dumb and annoying the characters were. Also, the main plot of the season was just pushed far to the background eventually and it mostly started to revolve around little side plots which I couldn't care less about.
The first six episodes or so are fantastic, but then it gets so slow and the plot starts taking way too many (illogical) twists and turns. I remember only the last two episodes are still kind of okay, but in the middle there are whole streaks of episodes where ultimately there's not even any plot progression whatsoever.