There is a time and place to play a wacky self-parody for laughs (for example, on an obscure Internet technology forum), but an adaptation of one of the darkest storyline in Marvel comics involving Gorr the God Butcher sure isn’t it.
Gorr was an effective character because 1. he was extremely successful in accomplishing his goal and 2. he was right (partially, at least) about the nature of gods being selfish and indifferent which caused the self doubts in Thor, and the key point of the storyline was that in accomplishing his goal, Gorr became a hypocrite who embodies the very traits he used as reasons for his god-butchering. Neither of these ideas were effectively adapted for this movie, so what’s the point of using Gorr the God Butcher.
The actors’ individual performance really isn’t the issue, because even the best performance from the best actors can’t save a flawed script, critics will just call it a wasted performance.