This is one of my favourite shows and I've seen every episode but one (and that was only because I was out of the country at the time). I do agree that the Second season has been inferior to the first, and they are dragging out the storylines as much as possible. It takes a whole episode to build up to a revelation which you then realize isn't actually very significant. Therefore, I hope that it doesn't come to seven series, as the rumours suggest.
My favourite character has always been Charlie but Sawyer is totally hot. There needs to be more occassions where he can take off his shirt. Saying this, I found Kate's story to be the best; it was the one most shrouded in intrigue.