We'd say that the performance seems adequate, considering the specs. Since the E7 packs the same hardware like the N8 - a 680MHz chipset with a Broadcom GPU - it is also interesting as an educational video how gaming would feel like on Nokia's current flagship phone. This GPU processes 32 million triangles per second, which is 10 million more than the 1GHz Snapdragon, so we must say it handles 3D graphics pretty well.
Nokia E7 Specifications | Hands-on
Nokia N8 Specifications | Hands-on