Unusually, I actually agree with a lot of Bob's criticism, but I don't think the flaws are as serious as he makes out. It's not completely joyless, there were a few moments in the film when the audience laughed. But, yeah, much less so than most Marvel films. I do agree that it was hard to believe their was any attraction between Superman and Lois, despite both actors doing a great job, it was lacking in the script.
Overall, I really enjoyed it and I'm such a Superman fanboy I went in my Kingdom Come Superman t-shirt.