Don't really post in gaming anymore, but figured to contribute here..
Best gaming experience I'll probably ever have.. and the worst.
Was the first MMO I played and was just in awe. Believe I started playing in Feb 2005, used a VPN to get around my college firewalls to be able to play.
I was in awe at just how massive it all was, the sheer scale and wonderment of exploring and being in this other world. I remember the first time I ran Deadmines with some random people and thought how cool it all was. Eventually leveled a few characters to 60, did a fair share of raiding and PVP, and enjoyed my time in the game, made some great friends that I wish I could get back in touch with. Think I "quit and came back" for BC and Cataclysm and that was it.
It was also the worst experience.. I was addicted. It ruined my college experience. My weekends often were waking up at noon, playing until 3 or 4 the next morning, and repeating. I put WoW above all else. School, friends, any of my other hobbies, none of it matter if I had some minor in game goal on my mind.
In game I can look back fondly on it, but when I realize how much it changed my life path because of my addiction, it's hard to think of it positively.