pockyD
Smash Legend
if the marth is fsmash happy enough and u dash cancel into shield fast enough you'll be rigth @ the hilt of marth's sword. I feel that its best used against fullhopped aerials.
i suppose if the marth is both ignorant enough to predictably fsmash your attack along with being slow enough to let you get all the way in on him
if you're playing a fsmash-happy marth, i'd just imagine dash -> spot-dodge -> usmash (jc from dash if necessary) would be much safer and more reliable, since you don't have to get to the hilt
and dash through, turn around, usmash is 100% more stylish than shield-smash =)