Runescape may not the best game but it is interesting.
However, being a member isnt all-fun. But the space in the members world is much more and the music, quests and monsters are quite challenging. The only drawback is that if you don't renew your subscription, and if your embers items are stuck when you are in the free world, then it will be a GIGANTIC problem to sell all those items.
Another thing I dislike about the game is the constant change of graphics in areas such as Falador, Varrock, Port Sarim, Draynor, Al Kharid, the Wilderness, Lumbridge etc. I hope they don't change the members area because I believe there is a need for the classic runescape to be there.
So overall, I would recommend RUnescape to be played but not on a more than 10 hour basis because the game does bore you.