REVIEW: Why do critics hate "The Orville"?
At Rotten Tomatoes it is "rotten," with only 20% of the critics issuing positive reviews ...
but the audience rating on the same site is a very "fresh" 89%.
My opinion: critics hate it because it can't decide whether it is an adventure series or a spoof of same. Scenes that seem to be perfectly serious are interrupted by moments of comedy, occasionally even surreal comedy. Audiences are OK with that "tonal disconnect," as long as it entertains.