Widmore: I am Charles Widmore. I am the true leader of this island and Ben has spent the last thirty years exiling me and working to keep me out of power. Our showdown will be truly glorious... as he shoots me after about five minutes of conversation just to ruin Smokey's plans a bit.
Desmond: ...Somewhat forgivable since he found Penny and that was his main story, but still. Two seasons where he does crap all after being such a fan favorite.
Ilana: Jacob picked me to be his last bastion in the war against Barry in case something went wrong. I gather up a bunch of people and then I make like an Arzt and explode without really doing anything. So much for build-up.
Tina Fey: Hi! I'm Widmore's shrewy second-in-command. And now I'm dead!
Jack, Hurley, and Ben are the only characters to get any real character development outside of their own episodes. It just irks me that we get such ****ty use of characters in the final seasons. No one has any motivations. They're just so burnt out by all these adventures that they just follow whichever person's in charge that day to whatever plot place moves the story forward. Why? Who the **** cares what they think? Let's just make Jack the hero again! Don't question it, even after he exploded a ****ing nuke just because he never wanted to meet Kate because love hurts.
3) It's the last season. They know it's the last season. It's been planned to be the last season since Season 3. So why, why, whhhhhyyyy are they still doing the same stupid stretch-out-the-mystery dialogue and plot games that sucked in Seasons 2 and 3 and made everyone go watch Heroes because they were actually doing **** like saving the cheerleader and saving the world. When all the reveals are being pushed back for later episodes and there's only a few more to go, that's just terrible writing and inability to leave that comfort zone that's been around so long.
4) Better explanation of the endgame. I don't want "The Force equals Midichlorians." No one wants that. But at least we knew what the **** The Force was, "an energy field created by all living things, that surrounds and penetrates living beings and binds the galaxy together." It's a universal energy of fate that some are tuned into more than others. We got that, it was enough, and everyone didn't want anymore from it. It was a cool concept.
Now what is The Light?
No, really, what the **** is it? "The Heart of The Island". Okay, then why's it so important? "Because the Island is special?" What makes it special? "The light." Why is the Light special? "Because it's the Heart of the Island." Like, I can get we can infer it's the good of all things and the cork separates heaven and hell and the darkness from seeping out into the world and causing global devastation, but we don't need to know what the chemical makeup of the light is. We just need to know why it needs to be protected and what would happen if it didn't and we would be fine. We never got that. Not once. And that's why it was so frustrating. "The light is good, the darkness is bad, the island is a cork that keeps the darkness from escaping and so we protect it." It's just some dumb explanations and writing, and really has nothing to do with the characters. It's just another button to press or nuke to blow up.