+ Nightwave has gotten me to play mission types and gameplay I don't otherwise do. + Most of the challenges get completed while just playing as I usually do. + Challenges are clear in describing what is required and you get feedback on progress in mission. - RNG based challenges. Example: slot X amount of ayatan sculptures, if you don't keep a stockpile it can take you hours to get the necessary amount of sculptures. - Time sensitive challenges. Example: capture X amount of Eidolons, if your play window does not match with Plains of Exile night time you won't get to complete these. - Long non-stop challenges. Example: 60 minute survival essentially has you sit in one tile, so as not to break the spawns, with a metasquad while watching entertainment on second display.