Best two reviews:
1) Newsday- It's what we do with our character that matters. This season— magnificently—reveals what Elizabeth has done with her's. You will be blown away. At least I was. (Rating: 100) Read Full Review >
2) The Oregonian- Colman is exceptional in everything she does, so she’s not afraid to make the Elizabeth of Season 3 look, at times, distressingly irrelevant and frustratingly complacent. ... Like Colman, the new cast members assume their roles with elegance and ease. ... The return of “The Crown,” with its irresistible blend of heightened history and peek-behind-the-brocade-curtain drama, is a gloriously welcome gift, arriving just in time for the holidays. (Rating: 100) Read Full Review >

Worst two reviews:
20) TV Guide- The series itself struggled between finding its own balance — with some episodes striking resonant chords ("Bubbikins," "Margretology") and others falling painfully flat ("Coup," "Moondust"). But as Elizabeth herself states during one of her meetings with PM Wilson, sometimes it's better to simply look the other way, to wait for this to pass. Season 3 is a time of transition — for the royal family, for the United Kingdom, for The Crown itself. (Rating: 65) Read Full Review >
21) Slant Magazine- Season three of The Crown lacks the urgency that previously made the Netflix series so engaging. This is partly due to the more subdued relationships between the older members of the House of Windsor, now settled into their various roles as sovereign, husband, sister, and wife. (Rating: 63) Read Full Review >