I have played 90% of all MMO's at launch and with the exception of que times this launch has been flawless. Servers are stable, not un-announced downtime, few if any game halting bugs. and little if any server lag.
Worst launch I have ever played falls to Anarchy Online. Servers where down more often than up, and server lag was really really really bad. Most people could not level past a point because quests would just stop working.
Wow also had a rocky launch.
Eq2 was pretty smooth,
Eq1 was up and down a lot.
earth and beyond was really bad.
I could name lots of them.
Also PS.
ALL MMO's have been out in "Modern Time"