This is just well-aged chuuni cheesy goodness. The writer knows exactly what he's writing and why he's writing it. It's plenty self-aware, and it's just here to have fun. And the moments when it's depressing, it's serves to build up that satisfying "BOOM!" of emotional overflow when Hajime shows up and do something cool.
This just sets the inner chuuni fire inside me ablaze, as I never had that sort of phase in my teens. Watching it in my 20s feels oddly nostalgic, yet light-hearted and fun.
As for plot, it's basically boy with harem goes to fight god, pretty typical as anime goes.
Overall, just give it a chance. For all the cringey chuuni stuff out there, this one's pretty well paced and written as far as the genre goes. With all the different problems going on in the world and our lives, it's great that we can just wind down and enjoy this sort of shlockey tropey story.
