I actually really liked the novel, so I'm hopeful that the manga will be given good treatment. If you're expecting an excessive amount of edge, there won't be so much of that. Dude doesn't really become "driven mad with revenge" but more "broken, and pissed off at a lot of people." If you want an Isekai with a necromancer type protagonist with all these death-related skills and undead followers and shit this might be a good read for you.
If you want a revenge story badly, revenge is certainly on the table, but it takes sort of a backburner because a lot of the people he wants to take revenge on are literally unable to be reached by virtue of being in a different world or being a literal God in some God realm somewhere. The others he can reach are either too powerful or he hasn't found them yet, so he's preparing/searching while doing other shit.