They've gradually unbanned players who've been wrongfully auto-banned since they logged on after the maintanance, including myself, but alot of other people got stuck in-game with the "Account is already logged in" error after getting disconnected once. They still haven't been able to log back in, but Nexon's started to take inquiries regarding this issue.
Nexon Forums - Does "ID already logged" = a Ban without notice?
But on top of that, people who have been able to log in since the maintanance (including those who were recently unbanned) have had to deal with lag, disconnects and game crashes. Suffice it to say, the servers are quite unstable and I believe the previous maintanance pretty much destroyed the game.
I won't be playing again until there's been an emergency maintanance.