Well there's an abundance of things that have changed since you left. Everything was given added depth, and quests are one of those things. Jagex realize that in the games old age, they need to update it with things that the many people that have ascended to the highest platform in the Runescape 3 world can still find a challenge. Some of the most recent quests added are worth playing for, and I would never advise someone to not try something. I suggest you come back, give a few of the new quests a go, and if you fail to kindle the love for the game that I'm guessing you had at one point, then at least you can say that you had a go and it wasn't for you. Good luck, friend.