I know what you mean about Lawrence of Arabia. I have recorded it seventeen thousand times and never watched it for some reason. (In fact, I just recorded it for the seventeen thousand and first time yesterday.) It took me forever to watch Citizen Kane, too, although I finally managed that 10-15 years ago. I still haven't seen Doctor Zhivago, either.
Re Lost, I find the mystery ungripping and don't like any of the characters, but I stick with it because I like having an hourlong show to watch every day.