It's so short it's barely even a demo! Still lots of fun, but I completely agree with you about boost mode not being fast enough. However if you get a boost from a takedown you seem to go faster. And it's amazing how much harder to steer it is too with a boost. The AI is a lot more evil this time round, I was just driving as I normally would in Burnout and to taken down. There's multiple routes too, and the traffic is definitely a lot less scripted. The demo level has a lot more 90+ degree turns too, and most of them are blind so you'll never know what's around the corner.
The only sad thing is that the crash views are 30fps. I'm hoping it's fixed because it's horribly jarring coming from the fastes 60fps you'll ever see back to a PGR2 like 30fps. It does play this eerie music in the background which is really nice, and your crashs combo is listed at the bottom of the screen. There's also a lot of stuff going on while you're driving which can distract you, and also your opponents tyres will leave trails of smoke which are impossible to see through. Very annoying.
The sense of speed is there (theres even motion blur as you drive normally), but the in the zone feeling when boosting isn't there from Burnout 2. Still plenty of time to fix it up though.