hi guys,
I also just got the onkyo 608 last week, and have tried out movies and gaming. oliver's guys helped me set up the unit, i use infinity speakers(sattelites). the setting is almost on the default, except for speaker calibration, center +2, surrounds +4, watching movies in this thing was great, every detail from the killbill v1 was there swords, effects, and vocals.
For gaming we use xbox and ps3 and it was just like you were there in the action especially in the 5.1 games.
On the reliability side, the avr was on for most of the day, the avr is quite warm but not that you get scortched, bit cooler than the xbox! hehehe
Very happy with the reciever. Was considering Denon 1911, but when i checked the specs went for the onkyo, and heard that onkyo receivers seldom have trouble.