If they were incorporated into the replays they'd be appreciated a lot more, 'cause they are indeed awesome. My favorite would have to be when the drums first kick in and the slow-motion shot of the Impreza in mid-air comes on, it transfixes me, it's so beautiful.
I miss the ability to switch to side-mounted cameras like in GT3 replays, you know, the ones placed right behind the front wheels, awesome when hitting hard braking areas to watch the rotors light up. Which is another thing I miss since GT4, if you're lucky you can only see rotors get red hot with extended heavy braking like at Le Mans, or coming up to Aremberg on the 'Ring, oh and only on premiums of course. If it's because of realism you can't see the brakes stay red hot at Le Mans at night either. But I digress.