I've just seen it twice.
1ST VIEWING: 6.5/10
2ND VIEWING: 8/10
1st viewing, I was expecting something complex, something more dramatic, with more depth, and maturity. I was disappointed.
For the 2nd viewing, knowing this is more of an action adventure science fiction movie than a real dramatic character study (It's more Death of Superman than For All Seasons), I really got into it.
The audience I was with seemed to love it. But the sequel needs more wit, cleverness, charm, warmth, and light-heartedness.
I might post a longer review soon but I'm just glad my favorite superhero ever is back and should be embraced by the 21st century audience.