Four criteria are used to figure out the ranking. Average Metascore for all games released, % of scored games with good reviews (75+), % of scored games with bad reviews (49 or lower) and number of great titles (score of 90+).
Bethesda had an average Metascore of 79.9 slightly ahead of Nintendo with 78.0. Whilst Nintendo technically had better games, they also had a lot more that scored worse than Bethesdas, which brought their overall average down. For instance Bethesda’s worse game was DOOM VFR with 69% whilst Nintendo’s was Flip Wars with 53%.