I have to agree. Lost had the potential to be the greatest TV show ever and indeed it was on track after, as you say, the first 2 or 3 seasons to be just that. But due to its success and the writer's strike the TV network demanded more episodes which inevitable became shite filler. I wasn't hugely impressed by the ending but then again I don't think there's any chance they could have done it well given all the hype. I certainly don't know how I would have ended it any differently. Never before and since has a TV show finale been hyped up so much.