Yes. Players don't respawn into boxes for Raiden's level 3, or into a float state for Dante's level 3. So the fact that players keep spawing in bubbles for sackboy's is pretty annoying.
Edit: I take back my statement, sackboy's level 3 is pretty fair. It mostly just depends on the size of stage.
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Well sackboy does not have maney atacks that can hit the playes easyer, and if they dont spawn in the bubble, then that would ake sackboy complete crap, with his slow gaining ap!