After all these years of playing, L2 is more of a hobby now.
I login, talk to my clan, in the chat. (or Discord or Viber...) I XP a little, I try different classes (the Dark Knight is pretty good :)
NCsoft's "Project TL" is rumored to come out soon. I am kind of hyped for that one!
Anyway, for me it's relaxing. So, yes I would say that YES, it's still worth playing!