The overall size is something I am waiting to inspect in person. I'd say it's my number 1 deal breaker along with poor ground clearance. The Escape is about 180" long and the Sport is about 173." I freak when I see an Escape and think the Sport is 7" shorter!
Pictures are not a good way to judge, but when I see people standing near the BS, it looks very compact and small.
The rear seats are not really acceptable for adults, maybe minions or kids, or both. I've seen videos of adults trying to sit in the back seats and I would be very uncomfortable. This is really common in all compact SUV's. I don't think the front seats are that bad, given the measurements compared to other small SUV's. Overall, I think Ford made a mistake by not adding at least another 7 inches to the over all length, to at least match the Escape.
Then again, the Sport is not being marketed as a full-size, macho, off-roading SUV. It's designed as a "fun" vehicle for weekend family use.