Having played two prereleases I have to say, I really like this format.
I've yet to draft it of course, but going by sealed alone...
There's not many clear-cut cheap-win bombs that your opponent can pull out of their ass and beat you with despite a better board position (notable exception: Delirium Sands, but that may be a smidge too slow for draft and I'm tempted to maindeck some artifact hate in this format).
There's decent removal (*cough* *cough* *glares at AVR*) and a few viable archetypes.
Played G/U control-ramp on Saturday and W/B (splash green) Exalted on Sunday and both went really well, regardless of the rares and bombs.
I have a blog now. I use it to rant sometimes. http://seabutcher.blogspot.co.uk/