Surprisingly or not - the F20/F21 has been a hit, and people seem to like it for one or another reason. And obviously its look isn't such a problem at all. At least not a deal breaker. Right now about 180,000 people (and counting) have decided for F20/f21 already. Despite the (IMO too steep) steep price, which IMO will have to be corrected (eg. more standard equipment for the same price - to give it more value more money) now when the direct rivals are available in new editions. And certainly some quality issues will have to be addressed ASAP (the rust on seat frames, too plastic & rustic interior materials in the cabin etc).
If anything is holding back F20/F21 (even greater) sales is the price, and some quality issues, and some hindered functionality. Not the look.
It's interesting ... it seems generally women do show more love & sympathy towards F20/F21, while men have more second thoughts.
Well the looks aren't radically different from the model it replaced so if you bought it then chances are you'll buy it's replacement. I'm of the opinion that fewer people will switch from another brand to the F20/21 because of it's looks.