I can't believe they killed off Eko. He was an excellent character.

Why bother to introduce all these good new characters in Season 2 and then proceed to kill off 90% of them?

I hated it when they killed Libby because she was a great character, and the fact that she was in the psych ward with Hurley could have really developed into an interesting subplot. I didn't mind as much about Ana Lucia, but her death was pointless as well.

And just when they save Eko from the hatch's implosion, they kill him a few scant episodes later! He was one of the last new characters left from Season 2, and one of the best. It's just unacceptable that they killed him!