Except Steam scores a binary - like it or don't - and the overall score is just what percentage is positive vs negative. You can't rate one or other, just whether you liked each game.
But Gamespot have gone too soon with their reporting, picking a time when the scores are still in flux. Fallout 76 is 72% positive, while Starfield is 75%. And Fallout 76 certainly wasn;t 72% positive at launch. It's not a fair comparison and is a nonsense story.