Late to the thread, I thought for sure it would be mostly dudes killing the show and how wack it is. Box Cutta killed this thread, c/s everything he said.
The show is still one of my favorites, but I have yet to rewatch it since the finale. I agree w/ the dude that said Across the Sea was a wack-ass episode which ruined Season 6. The fans were waiting for an episode like that, and Damon and Carlton gave it to us, but it was so fukking lame, bad acting, just made the mythology of the show retarded. Removing that episode and adding anything else would have improved Season 6 to me. I like the finale itself, I thought it was a great episode. Lost always had good finales.
Also, the show had great character development. Someone said the show had a lot of great characters, and it did. Some were unlikable in the beginning, and you grew to like them towards the end, and vice-versa. That's why the flashbacks were not useless (although they kind of were in Season 3 when they started showing us bullshyt like Jack's tattoos).
I still rank the show high, as the journey of watching it was great. No matter how wack season 6 was (it wasn't that bad), it was stll great.