Masteria Preview?

It was still an epic pineappleup. That being said, I expect (hope) for less issues with this one. I have a feeling dev was done in Korea, so things should be a bit better.

Dev is always done in Korea. That doesn't make it foolproof.
Remember Cake vs. Pie 2?
Remember the absurd design which had attackers using their real damage but defenders hitting fixed damage? Remember how defenders could do absolutely nothing if attackers had enough firepower to destroy the barricade without using summons?
Remember the implementation bugs which mishandled ties and wouldn't give out rewards to those rooms where defenders won (i.e., battle lasted 'til time ran out)?

Korea has designers who know the game well, programmers who implement what they're told to, and Tespia to iron out the coding bugs.
America has designers who might have imagination but seem unaware of game realities (like the realities of cramming hundreds of people in one map, or of infinitely-spawning aliens leaving no room for normal mobs to spawn), programmers (in Korea) who implement what they're told to, and no Tespia for "exclusive content".

Hopefully things will get patched in time to be playable.