If you're considering this anime in 2021, it's nowhere near as bad as the ratings put it off as in my opinion. Nothing about this deserves a 2 out of 10 and it's honestly a decent average anime if you just accept it for what it is. Is it revolutionary? heck no but it's not a terrible entry in the "average battle fantasy of the season" series. If there's anything this show does seriously wrong it's not shipping Kufa and Rosetti harder for their obvious good match lol.
If you want a series that perfects this trite formula to immense enjoyment, The Misfit of Demon King Academy is a perfect example of re-using these same tropes but executing them quite wonderfully. If there's a real problem with these "average battle fantasy of the season" shows, it's that they just don't do anything unexpected. But still, some nerds are going to spend their time writing three pages explaining how it isn't some Miyazaki flick instead of just having some fun.