Simply infuriating and annoying. Dont expect to get enough decent characters to do any good unless youre in the top 10 players of the game. People that have the good characters will always win the the top slots in the events and "PVP" ensuring their supremacy and making sure newcomers and casual players will not get the coveted 4 star characters unless youre lucky enough to get them as a "random" reward from cover packs. Not to mention that the rewards from one event will be the required characters in the next event, again unless your good enough to finish high in ranking, youll be locked out of event missions which makes it impossible to place well enough to get the characters needed for the next mission. Its a vicious poorly thought out and planned circle. Unless the game makers goal was solely to get money from payers instead of making a solid entertaining game for people to enjoy.