Zeze
Lifer
I wondaer if it is partly because of how they handled inject larvae/queens.
It makes me kind of wonder that if they thought injecting larvae was too annoying to put in the campaign, why is it in the MP?
Partly yes. The missions themselves are easy. In WoL Brutal, timed missions have razor-thin windows to complete (that you only find out after countless reloads) and even harder for getting all achievements.
HotS, it's easy peazy.