Should probably be shorter. You can easily get 5+ kills in FFA and at least 4 in 2v2. Which isn't necessarily OP but he builds meter really fast and his level 2 is quite good as well.
Hard to say when it's so early on if stuff really needs a nerf though.
I think I agree entirely, here's why:
-leaves you completely defenseless-- hard to move in the bubble + I *think* you spawn lower than you left off (so if Im in mid jump and S3 is activated, I end up lower, Im not 100% sure about this though)
-Sackboy has incredible movement-- he can grapple hook anyone escaping directly above, and can use the spawn portal to move across the map instantly
-This easily racks up 5+ kills with much greater ease than any other character
-The bubble prizes, while a good idea, allow him to build meter again
The time he has to do all this is great enough and requires no counter challenge. Compare that to guys like Big Daddy or even Kratos, and they actually have potential to whiff their super 3's. Almost all super 3's seem to require some sort of challenge, except Sackboy's.