Overall enjoyed it. I watched about one part per day, and it paced out well. I don't understand people complaining it's too long -- you know what you're signing up for. If you don't want four hours of this, why would you watch it??
I admit, the middle sagged a bit, especially all the exposition around stuff going on at Star Labs.
Also, both "set piece" battles with Steppenwolf seemed too stagey, and video-gamey.
Any time they're battling in a more "real world" environment, Snyder's action works better for me, like the battle with the psycho Superman.
Also, all the complaints are about