For me a good race involves great racing. That does not automatically equal overtaking in my mind. For example I thought Turkey was excellent; tense, nip and tuck with a few brilliant passes thrown in for good measure. We all enjoy overtaking, and whilst it needs to be easier to chase we don't want to be watching Moto 125cc!
From my own personal experience the two races I would call my "best", one involved 15 passes and the other none at all.