My "fond" UO memories:
* Working for weeks building up various skills. Discovering you can't steal in cities. Trying to role play with other players, and them just ignoring me to continue fishing (bots?)
* Trying to role-play, meeting someone on the road, starting to type out "well good day sir!" and getting one shotted even though I had a good amount of stamina. That was back in the day where if you specialized in damage spells you could literally one shot any other player in the game if you hit first. That was my first time of losing all of my stuff that I spent days collecting. Man I was pissed.
* After that the gank wave started. It reminded me of being in a war zone. Other players just popping out of the blue, exploiting any bug possible, to kill you. For example one guy sat behind a house and just one-shotted anybody that came close, then took all their stuff. You couldn't click on him because the game was a piece of sh!t that didn't allow you to rotate the map (since it was still garbage sprites instead of 3d). So it allowed him to freely kill anybody that came close with no chance of retribution.
* After a while they finally got rid of some of the bugs, but by that time the game pretty much became a gank or be ganked gank-fest. Players at that point had no interest in talking, or partying together, they just either belonged in a ganking gang or they belonged in a different gang. The game became a lawless wasteland. At this point I had cancelled my subscription since I wasn't interested in a one sided PVP fest where the side that hid the best won. I like playing games like DOTA, Starcraft, etc. where the basic premise is that you are there to fight other players. UO introduced this fairy-tale mentality that the developers trusted people to be nice, instead it turned into Grand Theft Auto with spells.