There's a lot to like about this show - the characters, the design, the universe created around it, the special effects and the fact that it's generally a fun show.
Unfortunately the quality varies greatly from episode to episode. The opening episode concerns an alien crewmember who needs to return to his homeworld... to pee. That's a gag that's funny for about thirty seconds. Another focuses on a child misbehaving at school. Honestly, is this the best the scriptwriters could come up with? Then there are episodes that are thrilling and surprising, with some very novel ideas - such as a first contact situation that goes very badly.
For me, a lot of the so-called comedy doesn't work - it gets in the way of telling good stories. Orville would have been better as a straight sf drama, ditching the comedy and the dull relationships crises.
As for a Star Rating, I'd happily give the good episodes 5/5... but the poor ones deserves 1-2/5. Average 3/5.
Not sure what this series is aiming for. The attempts at comedy don't work and it just seems to be a bad Star Trek impersonation without the good stories. Not recommended.