This show is terrible. But I love it.
And it's almost entirely down to two things - the amazing central conceit, and how well Alan Ritchson inhabits the role. They both do a lot of heavy lifting, and earn the show a ton of goodwill.
Everything else is often laughable. There's constant plot holes, contrivances, and cliched tropes. The supporting cast is often made up of mediocre actors, often with bad accents, who are usually mainly used just to constantly spout repetitive exposition.
I would love to see what a great team could do with the material (and Ritchson). But it is what it is. Even in its current (presumably unintentionally) shlocky state, I still love it.