One reason some might hate this novel is because the god made a mistake in reincarnating the MC but it explain later on that there more than one god and the gods in this story are not all powerful, they can be kill by human and monster and their power is limit by their belief.
Another reason other might hate this novel is that the story change tone when the MC reincarnated in to the other world but are you going to hate some one who kill you just because you went on a rampage due to rage and them not even knowing it you since you are a monster at that point and you have never have a proper conversation with any of them to let them remember you. This tone can also shift since anyone don't think straight when they're enrage.
Other reason they might not like the novel is MC turn does not take revenge for his mother and kill people who look on as his mother burn at the stake. One thing you have to remember is this is another world and MC is not truly OP yet, the one that capture his mother is a A rank adventure group that will later level to a point that can fight weaker gods do you really think he a zero year old have any chance to kill them not to mention the amount of knight or adventure powerful enough to kill rank 3 monster which is a the level of a dinosaur like the t-Rex station over there. This is another world and in it burning people who belong to the Vida race, to them Alda is consider the truth so the Vida race is consider evil. Will you protect a person classified by law as a criminal that you don't know, no you won't.
Being one year old and having a harem might sound ridiculous but remember there are many characters in this story is the several hundred to thousand to even hundred thousand year old to them their not much different between someone one year old to some one who twenty since they can just wait for him to grow up a little and it be ok.
You might not like him inferior complex but you have to known he was in constant abuse when he was in his first life and do you believe you can take on over hundred people with cheat like power given by god while you are curse?
Though the cooking part might seem exaggerated and long one thing we need to understaind is this is a world where cooking aren't being studied to such a degree as modern cooking and Vandalieu is Japanese so it no wondering most food is Japanese food.
The title say talisman emperor but after a few chapters all thing relate to talisman is thrown out, their was the MC cooking part which was pretty good but never improve on. There were also how every support character except a few are kill, cripple, or just written off. I'm not saying death is bad for the story but kill most of those character is just a lazy way to not develop their character.