i have mixed feelings about the finale. it was really great - kept me on the edge of my seat the whole time. very emotional, very touching. overall excellent.
but... it just didn't seem to fit the tone of the series. it was all about addressing character relationships rather than the mysteries of the island, and it's the mysteries that i really care about. that's why i watched the show.
i'm especially disappointed about the lack of answers surrounding the temple and its inhabitants. also the statue, and the tunnels...
also the motives of the Others is still not clear. we know that Charles was their leader, then Ben drove him off - but why was Charles so keen to get back? what interest did the Others have in the island anyway?
then there are the missing characters - Michael and Walt for example. and Eko! he deserves to "move on" as much as anyone.
overall it feels like the finale was a convenient way to wrap things up - distracting fans with a huge wave of emotion in order to distract from the fact that they left so many questions unanswered...
i think there definitely needs to be a spinoff to cover events we didn't get to see. just imagine it - "LOST: The Ben and Hurley Chronicles"