The top 5 big publishers (those who published 15 or more titles last year) and their best games were:
Take Two Interactive, with an average rating of 77.1. Highest rated game: Red Dead Redemption - 95
Nintendo, with an average rating of 76.1. Highest rated game: Super Mario Galaxy 2 - 97
Capcom, with an average rating of 74.5. Highest rated game: Super Street Fighter 4 - 92
Microsoft, with an average rating of 73.4. Highest rated game: Halo: Reach - 91
Electronic Arts, with an average rating of 72.6. Highest rated game: Mass Effect 2 - 96
The highest rated of the smaller publishers (those who published between 7 and 14 titles) were:
Telltale Games, with an average rating of 78.4. Highest rated game: PSN release of Tales of Monkey Island - 86
Aksys Games, with an average rating of 73.5. Highest rated game: BlazBlue: Continuum Shift - 87
Atlus Co., with an average rating of 72.4. Highest rated game: Shin Megami Tensei: Persona 3 Portable - 91
Disney Interactive Studios, with an average rating of 72.4. Highest rated game: Toy Story 3 - 78
Xseed Games, with an average rating of 70.3. Highest rated game: Korg DS-10 Plus - 81