Ok, problem #1. I assume you used Windows Movie Maker to output your file?

Most people don't know this, but when outputting a file/movie for YouTube, only certain programs allow you to "up" the bandwidth/resolution settings.

I don't think iMovie allows it, I KNOW Windows Movie Maker doesn't so that could be part of the problem with the resolution.

Problem #2: filming into direct sunlight would give any camera fits.

Problem #3: Their lens is horrible. The nose of the car looks like it's pointed at the sky.

Final summation: if the Go Pro was $89 fine, but if it's more than that, there are better options.

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Current ride:
2007 Audi RS4

Previous adventures:
2001 Diablo 6.0VT
2006 SL600
2003 Porsche 996TT
2002 BMW M3 widebody
2001 Nissan Skyline GT-R
2005 CLK500
1998 Diablo SV
1998 Toyota Supra (850hp)