**Auction house not recognizing certain items...so no one can buy them.
**Not receiving reward at end of raids.
**Crafting quests will not complete at certain levels so you cannot craft high tier items
**Mail causing FPS problems... yep in game email.
**Sound loops causing hard crashes
**Many land/ground items cannot actually be placed on the ground.
**Multiple mission complete objectives do not finish the mission (Some cannot be completed because you can't even click the object needed to complete the mission)...when they do... no mission complete bonus given.
**Major lag issues
**Not gaining any reputation to earn achievement towards crafting items.
Just to name a few. And THIS is why I refused to play even though I have friends who do play. WAY too buggy. These would be akin to:
**Purples not being available on WentWorths because no one can craft them or trade them
**Itrials/TFs not giving end bonuses (Could you imagine completing a Keyes and not getting a badge or incarnate component...grr!)
**Not being able to modify your base because floor items won't go on the floor
**Badge progression not working at all
**Major lag whenever you have any in game email
**Frequent hard crashes (PC reboots) due to sound loops in certain TFs.
**Not getting mission complete XP after missions or TFs
So I consider these pretty game breaking and in need of attention right away instead of giving the players a Halloween and/or Christmas event. From the friends I do have who play WildStar...they are not upset about the events...they would rather the game...work.
Unless you're talking major game breaking bugs, New Content is always going to be a priority for the simple reason that it's what draws in and keeps players. There's also the problem that a lot of the bugs the devs could never figure out what was causing them. The code base was simply too much of a mess, and a lot of it was undocumented.
When you're talking new content keep in mind as well that bug fixing is a programmer issue, so that does leave your art department, SFX, writers, and everyone who's not hunting bugs to work on new content.