well I'm a little on the fence. I think it depends on the map really. I'm a small area it would be devastating with that sprint, but in a big area you have to time the sprint so you don't go too far past the enemy and waste time turning around. If it was a little longer i wouldn't be worried, but im not convinced.
on the bright side though, it does look interesting and at least decent as far as we know, and his lvl 2 is beast
IIRC, you can use other moves during both of Big Daddy's level 2 and 3 supers. I played with him at Fan Expo and I got a number of kills with the plasmid which is specially useful with his level 2 super cuz people keep jumping when they see you enraged.
I wouldnt say big daddy has the worst lvl 3, it looks decent to me, and like i said earlier, it kind of depends of map size.
I am not a fan of his lvl 1 though, it is going to be hard to get good at timing that. Fat Princess's lvl 3 is pretty hard to avoid, I would be suprised if she didn't get three kills. And If you get extremely lucky you might get 4, but thats if one person dies very fast at the beginning of it.
I just love how every character has a balance though. Big Daddy has a great lvl 2, a very very tricky lvl 1, and a decent lvl 3
Fat princess has a good lvl 1, a great lvl 2, and a decent lvl 3. And you also have to account for the situation you are in, and the skill of your opponents when it comes to dodging. not to mention how combo heavy a character is so his AP rate might be varied.