From the quality, to the variety, to the balancing act it does to take you into a comic book world yet still feels engrossing, is just stellar!
It hits all of the right notes that my superhero comics did when I was a kid.
And, the variety is amazing. There are full, partial, and mini expansions that keep you going without feeling like someone is just trying to do "a money grab" from you, and feel like you HAVE to get them. They are optional.
But they actually make you wonder how they could possibly keep thinking up all of these new things, and why other companies can't do it too.
I have played 5 and 2 player, as well as solo and love every bit. I do agree that solo can be a little confusing at first, but once you get a better feeling for the character powers, it all falls right into place.
If you are into superheroes, you will be hard pressed to find something better!