Yeah, like everyone I played it in my preteens and stopped around the time I hit my teens. The quests were pretty good, mostly because it lacks any "Go here, kill this, bring back x of these" quests. I loved how it was a browser game, no downloads needed.
But still, it was a grind fest, it didn't look that great and the community wasn't the best.
However, I loved being in the forums there, made some good friends who probably have long since left it. I fucking loathed however that you needed a membership to use the forums, and that Jagex were a bunch of 'think of the children' do-gooders who wouldn't tolerate the least amount of bad or dirty language.