I think there’s actually an inherent problem with a TV series in that model.
Critics for TV will be hugely weighted towards reviewing the first episode, which is what the publications always want. If I recall here some fans were a bit iffy with The Orville to begin with but became bigger fans as it went along, which is hardly unusual for TV shows (Buffy for example was pretty awful when it started). Some may be rating it today after having caught up. At least with a movie all should have seen the same 2 hours to provide a fair comparison.
As someone involved in the past in online opinion gathering you also have to be very aware of the element of self selection. A large element of those giving a rating will do so because they really like something. I’m not going to give a rating for Taken because I have no interest in it at all so will just ignore it but a critic has to watch something they may have no interest in and give their views as an inherent part of the job. Which is why in most cases the audience score is higher (special cases like The Last Jedi noted).