Oi ! You ! The script writers on "Lost" - I'm coming to get you.
Yes, I know you've finished writing it and the final series is airing on Sky just now. But this gizmo on a my head is a hydrogen bomb rigged to explode on impact so I'm hoping to break the time-barrier and make you change some stuff when I come down there and head-butt you.
Do I have your attention ? Good - I only have a few perfectly reasonable issues.
Firstly, quit putting in new twists before you've resolved some of the old ones. After a while there's no drama - you just shrug and think "Oh that bowl of mushroom soup hasn't been explained. I'll bet we won't hear a word about it for twenty episodes and then it'll fall on someone's mother's bodyguard's sister's head for no good reason."
Secondly, characters. If you will insist on gratuitously introducing new ones, you dilute even the comic-book paper-thin characters we almost care about. Best to work on the basis of one-in, one-out. And when you kill one off, make sure they damn well stay dead.
And thirdly, totally ignore me. I'm just a guy with a nuclear bomb on his head. What you do is totally marvellous - do you really have to stop after series 6 ?