Depending on whether you meant the third episode of the first season or the third episode of a later season, here are other highly-regarded articles and perspectives:
When Black Mirror Is Good, It’s Very, Very Good - Vanity Fair Black Mirror Part 3
: If you are looking for a broader critique of the show's transition to Netflix, the Vanity Fair review argues that while some episodes feel "bloated," others like "San Junipero" represent the series at its most sensitive and brilliant. Community Perspectives Depending on whether you meant the third episode