Guild Wars was the first online gaming experience I had. It had me sitting tight in front of my PC many nights and thus, preventing me from doing stupid shit as a teenager. I met a lot of friends in Guild Wars and many of them are here and ready for the sequel.
Guild Wars taught me more than my family ever did, heh. Leadership, comradery, english, moral values, different cultures... the list goes on.
I played it since 3 months after launch. Racked up about ~7000ish hours played. Maybe a bit too much for my own good. I'd do it again though. No regrets here!