I think the problem with seeing value that way is with it being all online and with friends etc a HUGE chunk of the time and experiences you gained from playing it were down to you. They weren't added or scripted into the game by bungie, it was down to you keep playing over and over. It was just something you happened to do with your friends. Otherwise gta and witcher etc would be described as infinite length because you can always go back and mess about or in the case of gta replay missions like you do in destiny.