Hands down. And not just because they're my favorite couple. But I think we all can agree that the show was COMPLETELY shot to hell, after they left. If they had stayed, maybe Mark actually would have kept the show on track, stayed focused on the main characters... and maybe the show wouldn't have turned into the total shitfest, that it is today.

And as much as the school shooting circumstances sucked, and as sad as it was... it MADE the show what it is. It was without a doubt the biggest turning point in the whole series, and it made for some amazing storylines! I actually think it was one of the greatest things Mark ever did.

^ even though I'm not the biggest LP fan I still think that they are vital to the show.
I liked s7 a lot more than s6, I must say and at first I was glad they left, but after a while I just realised how much I missed them.

All of the other things are pretty vital to the show and lead to some amazing storylines/moments. I really wish that LP wouldn't have left :(

Or Brooke losing C/B I guess. Or Katie; Totally unnecessary...
I'm sorry, I don't think LP could have saved the show if they stayed. The show was going down hill after the first handful of episodes of S6. LP's was really the only good stuff I remember liking. Even some of their scenes were a bit on the boring side. I think we need to face that LP or no LP, Mark is OUT of ideas and shoulda ended the show a LONG time ago...

1.Leyton leaving
2.The whole Katie craziness
3.Sam leaving...she should have come back
4.Brooke losing C/B...How else is she going to live her dream of being a fashion designer....
.....everything else happened for a significant reason!

just destroyed the show and never will be the same again !

As a BLer, definitely this :D
But I loved almost every storyline that's listed up there...they basically MADE the OTH we know today. The school shooting episode was incredibly sad of course but the episodes afterwards were so amazing and showed how the characters stick together. And even the whole LP/BL drama...come on, we all went crazy about who's gonna end up with who :D
Okay, there were pointless storylines as well like the Katie gone crazy storyline but then again it made the season 7 finale perfect imo...I was so shocked xD

Definately. Their relationship was what kept me watching. Brachel friendship ending and Jeyton ending are also things I wish never happened.

I would say Lucas and Peyton leaving the show but 1. I don't watch anymore so they never left to me lol and 2. I don't wish that they didn't leave the show or Tree Hill, I guess if they had to move on... I don't really know/understand why they skipped town, but instead I wish the show had ended then. Like seriously. Losing 2 main characters RUINS a show and I think OTH 2.0 is proof to that

Excluding the option with Brucas breaking up (which lead them to being endgame)and Leyton leaving , all except Katie made sense.

Of course, the show has gone downhill after they left

Worst thing to happen ever.

!