I might have had troubles taking those bubbles seriously if the dude had been goofier (like the Naruto filler characters usually are) but he has actually acted in a pretty cool and composed manner. Plus the bubbles have a certain charm as new weapon as such because they are different compared to most things: They float around unhurriedly and can be even hard to see and avoid. Although realistically speaking they should be quite adversely affectedly in a windy outdoors environment (unless you are upwind and want them to go specifically downwind) but that remains to be seen.