– Some game functions do require having almost like a subscription because they expire in X amount of days.
– You don’t get to directly do stuff with your high level friends until much later in the game when you are all top levels. The game feels like a single player RPG until then.
– The servers can’t sometimes handle the load of having many players on it, like on the weekends during special event days (when most people play).
– Some common known bugs in the game are not addressed by the developers.