Man, I like this show and at the same time I am incredibly, super annoyed at the gaping holes left behind.
Season 1 was pretty solid. Plot points were completely dropped and some things made no sense - but I enjoyed it. I didn't mind all the characters and red herrings, but once we learned Henry was the killer, I went back in time and didn't understand the trophies from his victims. If was doing it all a ruse to throw suspicion so he could eventually kill Grace, why take the jewelry from his victims? And how did the blonde online camera porn lady steal them? At one point someone kidnaps Marcella, seemingly to kill her (I can't remember who it was) and she goes into a fugue state and the next scene she is at home. No explanation. Nothing. WTH?
Season 2 was starting to piss me off. I thought the child killer story was sufficiently creepy, dark and sad - but I cannot stand the huge cast of characters as red herrings and then the killer turns out to be someone we saw like what - ONCE - in the first 6 episodes? That is just cheap ass writing, IMO. If you're going to make me guess and try to create twists & turns, you can't then make the killer Joe Blow down the street that we saw one damn time, with no back story and maybe one speaking line, until the final two episodes. That sucked. And how the hell did she bury a body in the police station? And MY GOD, are we really supposed to believe they found that body in the span of 2 minutes by looking at a photo that had a map on the wall with something circled? And that led them to the exact spot in the police station where it was buried? Ugh.
The hypnosis stuff was also annoying. So Marcella finally decides to get help - something any half intelligent human being in in the same situation would've done way before that point - and it's magic hypnosis?
I can get behind the changing her identity for S3 when she realizes she killed Juliet; however, why the hell did she cut her face like that? To leave her DNA behind? To punish herself? To try and annihilate who she used to be? A mere mention of her motives in S3 would've been great.
And Season 3 - I thought it ambled along for too long. I had no clear understanding of what she was trying to do other than, "Bring down the McGuire family." And WTH happened in the beginning? She was with the accountant, who they killed, and then she "goes back" to Finn? So...the accountant didn't know she was with Finn to begin with and then switched to him? Or did she seduce the accountant first to get to Finn and "flip" to gain trust? I enjoyed the backstabbing, the tension and the weird characters in S3 - but until the last 2 episodes, I didn't understand her purpose. Even then, are we to believe she engineered all of that - or it was just happy circumstance (for her) how it all ended?
Don't even get me started about her treatment towards Sangha.