Server queues
Disconnects
Terrain bugs
Stability issues
Client issues
Quest bugs
Class bugs
and many more
These are the sorts of bugs ALL mmos have in the launch period. WoW had them all, it was known to be a bad launch which had many many bugs. bugs which stoppped play. Game breaking bugs and server issues, but they got fixed. But the time it took was months.
I highly doubt you were there if you feel wow didnt have its issues. Issues which dwarf TORs issues. But, players stood behind the IP as back then, most MMO players were adults back before the youngsters took over, and us adults know. MMOs take time to evolve and grow, and especially time to iron out the launch issues. It took blizz months to get on there feet. WoW was not the gospil MMO people claim it to be.