Yep. I finally got around to finishing the series a couple weeks ago. I was always critical of the concept of Lost because I thought it would drag on for too long if it was any longer than 2-3 seasons. Overall, I was still pleased with it. Way better than what I expected.
Seasons 1 and 4 are amazing, with season 4 being the best imo. Season 2 is solid. Season 3 starts off weak but finishes strong with its mind blowing finale. Seasons 5 and 6 sucked. The Jacob and Man in Black subplot actually had an interesting premise to start off with, but ultimately the mythology theme fails in LOST.