I found that I played 2nd edition for years without having to pull out a rule book for every little thing, and I found that both 3.0 and 3.5 were so complicated in some areas, that a single round of combat took way too long to figure out.
I don't know whether it was a rules or the evolution of the newer players, but I have also found a higher incidence of overpowered characters that seem to have awesome abilities at low levels...call me old school, but characters that had a very real chance of dying had more "skin" in the game. I found that 3.0 and 3.5 characters went from being heros to super heros, and well, there used to be a game system based on Marvel characters, wasn't there? I stayed away from it for a reason
In table top, I've gamed mostly with one DM (Alacrity), who is now my husband, so we stuck with 2nd edition rules with some changes along the way (many of which are posted in the DM's corner here on the site). We had another friend who was also a DM, and he liked to dabble in different gaming systems, so we tried Star Wars, Ars Magica, and some system that was so realistic, our characters were nearly defeated while trying to cross a log bridge (seriously...a broken leg was near fatal, due to the chances of healing badly or infection leading to gangrene).
We still play modified 2nd edition, and Alacrity incorporated some elements of other game systems that he found appealing. Our characters have virtues and flaws, for example, from Ars Magica, and playing to your V&F adds XP.
One of the nice things about gaming online is that the players need not be overly familiar with the particular set of rules, as the DM will do the rolling offline and post the results (usually in the form of a narrative). Since I have always been more about the role than the dice roll, that suits me fine!