When it comes to the final season of any show, it's hard to evaluate it on the merits of the season alone. This problem is even harder when you talk about epic shows who manage to get past the five-year mark (and then some). After all, the final season is supposed to be the culmination of all the seasons that had come before. This is the climax - the height of all storytelling and the realization of years of writing, re-writing and manipulating various characters, events and plot lines. All these have to come together to work somehow.
We all knew this was coming once the folks behind Lost announced that the should would definitely end. It was a bold move to give the show and end date when any studio executive holds fast to the silly belief that there's never too much of a good (and profitable) thing. But still they kept to their word and worked their way to this final ending in all its glory.