Teen Wolf: I stopped watching this show after 5a, but stopped loving it after season 4 ended. Almost all of my favorite characters were dead or gone, and the remaining ones that I did love are continuously tortured. I didn't like the direction the show had gone.
Once Upon a Time: I was periodically watching 4b and 5a, but didn't really care for what I'd seen. Too many new characters had been introduced and it messed with my head too much. I didn't care much for the storyline anymore, and, frankly, the only reason I stuck around so long is because I had gotten my mom into the show, and well, Colin O'Donoghue.
Lost: I've only gotten about halfway through season two, but I got distracted with watching other things, and never felt like going back.
Doctor Who: I fell out of Doctor Who because my brother and his wife had gotten into it and she got WAY too obsessed for my liking and kinda ruined it for me. But even then, I hadn't really cared for it. I stopped watching it all-together when Matt Smith left, but I've realized I didn't really care for the Eleven/Clara companionship. I missed Amy and Rory.
The Vampire Diaries: *shrugs* I've tried to rewatch this show several times, but I can't seem to get past halfway through season four. I've seen all the way through season five once, but I always get stuck in the middle of season four.

I loved Lost from beginning to end <33

The Vampire Diaries declined A LOT after season 3, but it started to pick up in season 6 and I think season 7 is the best one yet.

Doctor Who I fell out of too for a while, but recently I've been catching up and I still really enjoy watching it despite its decline in quality.

Once Upon a Time was my biggest disappointment, but I loved it SO MUCH in season 1 and 2, but then after 3a it completely dropped the ball, and it's terrible now! I only watch it in the slim hopes that it might get better, but I think I'll have to stop watching completely if it doesn't turn around by the end of season 5

Don't watch Teen Wolf

Love OUAT, but it's no longer my number one (SPN is). It still has it's great moments but doesn't wow me as much as it used to and I hate everything they've done with Rumple/Rumbelle lately. Still love Emma and Hook and some of the other characters/storylines. Snowing need to disappear. Never liked them, but these days they are useless and the writers obviously just come up with random stuff for them to keep them around.

Love DW too. This past season was great. Hate having to wait until 2017 for the next episode and hate Moffat leaving :(

I'm one of those fans who usually watches shows I love all the way through and puts up with all kinds of crap but....even I had to give up on TVD. It has just gotten too ridiculous and disappointing. Kai's death (throwing away his character development and Bonkai potential) was the last straw for me. Stopped watching after that (season 6). If I give up on something I used to love you KNOW it's bad!
Still watching TO and did watch the last TVD episode for the crossover though. Klaroline is the reason I started watching in the first place and that phone call broke me. It was perfect. So glad Caroline will be in NOLA looking for Klaus with the 3 year jump.
TO was AMAZING last episode though!

I must say I do prefer the old cast with Allison and Jackson and Isaac but Stiles is my favourite character ever and I will continue watching Teen Wolf for him and for the potential that Stydia have as a couple! I also watch it for Liam, my baby <3

The Vampire Diaries has become really bad this season. I absolutely haaaate the storyline with Caroline and the babies. It's so messed up. And I just miss Delena too much. But I kept watching for Damon & Steroline.

And I agree about Doctor Who ! I really don't like Capaldi as the Doctor. David Tennant and Matt Smith will always have my heart. And I can't stand Clara. Amy and Rory are the best companions <3

I gave up on TVD after season three. I haven't watched any of the others.

Lost is one of my favorite series all time :) i also like Tvd alot :)

Still love this. <333 I also gave up on TVD and OUAT.

I still LOVE Teen Wolf!! And OUAT. I'm okay with DW. Never watched TVD and I loved Lost, though the last two seasons were confusing.

It's my favorite show with GoT!

And honestly I don't get why so many people stops liking it, Season 5 is one of my favorite seasons along with 3 and 4! Honestly I think Teen Wolf is way better after season 1... Love all the other seasons! And in terms of cast and special effects it only got better and bigger and more epic, so I have a hard time understanding why people will think that it "sucks" now (probably because one character left or a couple you wanted didn't happen) This is just my opinion of course but I don't get why someone would lose completely interest in a show just because of one character leaving or one couple not happening! The way I see it you can't have loved the show much if that's all it takes.

Anyway I'm sorry for rambling on... And please don't think I was talking directly to you. (No offense).

PS: Sorry for bad English

I have the opposite problem with Lost. I fly through season 1 to get to the new people I love in season 2 (Ben, Ana Lucia), then rush through 2 to get to season 3 (The Others), etc. Lost requires a crazy marathon.

I officially gave up on OUAT after season 2 and never regretted it, even a little bit.

Lost + TVD + OUAT though all these tv shows somewhere along the way disappointed me. I am biased towards TVD but overall Lost changed TV imo.

I love Doctor Who - the more recent seasons are my favorite.
Lost I also love.
I agree with OUaT and the Vampire Diaries, I gave up on both of them, as well.