Having owned both the Fiesta and the Focus sedans (we traded a 2011 Fiesta in on our 2012 Focus), I can say from experience that we appreciated the extra length of the Fiesta sedan. To answer an earlier question, yes, the rear seat folds down. Although the feature leaves something to be desired. You have to fold the seat back part way forward, remove the headrests & stow them in the footwells, then fold it down. It does not fold flat though, and that is just senseless. It does, however allow for stowing cargo of greater length than the hatchbacks can accommodate. In the case of the Fiesta, you gain 13" in length, and that is a very useful addition. I was at Sears once and bought a pruning saw, which was a bit over 6 feet long. I was able to fold the seat and thread it through between the bucket seats and get the trunk lid closed. Not possible on the hatch.
As for looks, that's pure preference. In our case, I like the looks of the hatch, but my wife likes the sedan better. Since she drives the thing most of the time, we got the sedan.
2010 Focus SE w/Sport package