I love my Mossberg 930. I would buy a 500, but thew 930 works for me.
Let us not make shotguns into 1911's. If it can be made from barstock tool steel, it is not always better.
Some people actually want to carry and use these weapons. Those people might like an engineered product which makes the best use of materials to make a tough, light, handy tool for use for a certain task.
Personally, I think a nice light, durable shotgun with a short barrel, and extended mag probably has many good uses in war. The 590 fits that bill, and an 870 wouldn't be far behind.