I don't think Exile Island is unforgettable at all. I actually really like the season and a lot of the characters are memorable to me. It was also the first to have exile island (well I guess Palau was but not really), and although I don't like exile island it was pretty memorable. All the seasons are memorable to me, but if I were to guess which ones wouldn't be memorable to the general audience I would guess Africa and Thailand, Just becuase they were on the boring side and aired so long ago.