It could be useful in teams, (who expects you to sticky yourself? then you can brush it off onto an opponent)
Vs'ing the characters it works again, you may be in the position to do this.
It can be a bad thing in 1vs1 unless you brush it off onto them and they don't notice, but if they do it'll be hard to get it on them before it falls off, and exploding yourself takes to long (the 'now' and all that animation.... in 1vs1 would be a free attack for your opponent)
It can be a great suprise thing, if you manage to stick yourself, brush it off onto your opponent, or be bait.
you--------space-----opponent
'now'
you---opponenet rushing in to punish lag
you--explosion---opponent
=p bad diagram is bad, but you get the idea.
Usefulness out of 10:
2/10, depends on exactly how situational it is.... if its less situational then we think (multiple characters, multiple spots)... 3/10... if its even MORE situational then we think (only Link, only BF), 1/10....
It's a pretty low risk, medium/high/no reward.
It's like gambling =p