Text/Titles: 2/5 ( A little more modern font wouldn't hurt. Check out: [link]http://www.dafont.com[/link] for tons of free fonts.)
Transitions: 3/5 ( Adding some minor effects never hurts, like fading in/out, swipes, etc. etc. )
Music: 1/5 ( Sorry, just not my thing. )
Video: 3/5 ( The on-car cam was pretty shakey, maybe you can stabilize it or put it on an off-road r/c with plenty of suspension travel to soak up the bumps. )
Driving: 4/5 ( You guys handle your rigs pretty well, I can't wait to see future videos from you guys down under! )

Overall I would say this is a great start to a potentially awesome series of videos.