Marc, you review is pretty much spot-on! The split screen in this Lego game becomes a huge hindrance in coop gameplay. You can best explain/show it in a mission with Batman and Superman when Superman needs to use laser vision. Unless Batman stands right next to him and removes the "split", it is nearly impossible to aim the laser vision where needed when split.
However, the game itself is by far more entertaining and enjoyable for our family than any Lego game going back to Lego Star Wars Complete. We just, often times, take turns playing individually