I played AO at launch. Lol... I still remember getting 1 fph (one frame-per-hour) in Tir after creating my character just trying to get out of the city. What a nightmare... Anyways, I played a Fixer on RK2 for about half a year. Then, I quit and came back and played about another half a year. Got to about level 88 perhaps, I don't recall.
Some of the most amazing sights/experiences I've had in gaming were in AO. Watching the sunrise coming up over the shipwreck-strewn plains outside Old Athens, travelling through the Grid, running through the far north sector with my uber Fixxer-speed as giant sandworms exploded out of the ground to eat me... I also played a Meta-Physicist to 60 and saw the number of pets ramped up to 3. I loved the sheer insanity of having to summon/control 3 separate pets. Never a dull moment... The Yalmahas were insanely cool.
But then everyone carried shotguns. Even with around 200 different types of weapons, the only real useful one was a shotgun. Until that was nerfed, then everyone carried hammers. Even doctors.

Great setting, interesting role-playing opportunities, but soooooo many problems...
With Grid Armor broken, no use for a Fixer in a group, and endless pointless mission-blitzing, I spent all my time posting in the Fixer lyrics thread on the official forums (they've probably been wiped several times since then). I left with the great Fixer exodus, broke my installation CD in half.
Then, there were two expansions released. There was a free 1 week trial so I thought why not. I installed the download and played around a bit... to find that they had drastically changed the start-up area. The previous start-up area with the l337's was what made AO stand out to me at first. So, that was a definite negative. Then I realized that they had completely changed the camera to make the screen cramped and navigation difficult. At launch, AO's camera was awesome. You could literally zoom all the way out to the moon above you until you couldn't even see your character anymore. I uninstalled the trial.
Still, the Fixer community on rk2 (they also had one on rk1) is still the best online role-playing community I've ever run across, by far. Nothing in WoW even came close... A lot of what was good about WoW was stolen from AO (and a lot of other mmorpg's, too.

)...
Jam it back in, in the dark.