Will Arnett plays your quintessential lone-wolf police detective who’s reluctantly paired with a new partner each episode in the Netflix comedy “Murderville,” which is premised on a central gimmick: A different celebrity guest who has zero knowledge of the script joins him each time as his latest detective-in-training, and together they must solve a crime. Some on the roster, such as Conan O’Brien, have legit improv experience. Others, including former NFL running back Marshawn Lynch (who is terrific here), have none. Let the improv-orama commence! I like the willingness to experiment and this…
