Earlier this summer I decided to join the ranks of the roadies and cross-over from a strictly dirt/trail background. Had an opportunity to test out a few different bikes and the Dogma was the first bike I road. Maybe not the best of ideas going straight to the Ferrari of road bikes, but it gave me a very good understanding of what I didn't want in a bike.
First, yes, this bike is amazing. Great design, very snappy and responsive, fast, fun and very light. But, when you are just getting into road biking, I wanted something that was more soft and smooth. The Dogma is very rigid and after a long ride and my body not being used to it, I could definitely feel it. For the more advanced rider out there, this bike is amazing, it just wasn't for me in my stage of riding.
Second, like Robert mentioned, the price was hard for me. Granted I was buying the bike, but every time I took it out for a ride all I could think about was the fact I was on $10,000 of carbon goodness and the slightest problem could equal major disaster.
Really, there aren't many real negatives to this bike except it just wasn't the bike for me at this time in my riding experience. Maybe a couple years down the road if I start racing and need this type of bike I could justify the few cons to balance out the many pros the bike as to offer.