I played it from 2005 until around June 2011, although after the controversial updates that happened on 10 December 2007 (which resulted in a large amount of the playerbase quitting), I began to slowly lose enjoyment in playing the game. All credibility was lost in early 2012, but in February 2013 a poll was created by Jagex letting users decide if they wanted some old-school servers back, which date back to RuneScape as it was in 2007. I started playing on these old school servers, and I've gotten back into the game I knew and loved during my childhood and early adolescence.
I would recommend giving these old school servers a try if you're an ex-RuneScape player. The current, main version of RuneScape has no sense of achievement any more; everything has become easy to train and earn. Much like how World of Warcraft has been seeing a down turn as well.
You can check the RuneScape website if you don't believe me about stating the recent addition of old school servers.