1 in 10, i don't believe that for 1 second, you eithet wrent patient about spawn rates or didn't know how to do the quest . As i said to the guy 1 in 500, even dungeon quests work fine. I also leveled 2nd char but gave up on level 40, on that char i encountered 0 bugged quests, i took a different levelinv route.
About class bugs, ye there are some, mainly issues with new core mechanics or anti fly hack which is doing amazing job.
Events inside dungeons and raids also scripted fully.
Events in open world with npcs and quests a bit less, but still more than ive ever seen on private server.
I tell you this so you understand that yoi are not waiting in vain, but when update hits other wotlk realms it will revolutionize them. THey also plan to transfer all raids and dungeons and all outland zones and quests and Northend zones and quests to MOP and CATA.
So just wait a bit more lordaeron scripting is doing good for all expansions atm.