And from Gamerankings, some 'casual games' that have scored very well
http://www.gamerankings.com/
Rockband-93/100
Guitar Hero II-92/100
Rez HD-90/100
Meteos-88/100
Elite Beat Agents-87/100
Planet Puzzle League-87/100
Guitar Hero III-86/100
Locoroco-85/10
Nintendogs-85/100
Clubhouse games-82/100
Uno 360-81/100
I could go on for a long time. Some casual games just have less flaws, greater functionality, more depth and just a lot more to them. And they end up scoring well.