"Well, trying and reviewing the co-op mode" - I completely agree. Lucious should have tested out co-op for his review. This shouldn't have gone live without it. That said, there is something to be said about wanting an epic RPG to be balanced for single or cooperative play. For instance, I personally don't have a schedule conducive to cooperative play, so I rarely get to do it much. He should have at least played it cooperatively enough to test the mechanics and to understand how and if it changes gameplay.