Bashdemears
Jiggs2stronk
Basically, I think his counter shouldn't kill any momentum he has gained. Instead he should keep some of it and slide a bit. Not off ledges (duh)
You have to be careful not to confuse 'dangerous' and 'op'. Dangerous is is Melee Jigglypuff, who can kill you before you can blink. I think that kind of applies to Marth, too. OP is vBrawl Metaknight, who is impossible to outright counter.In the right hands, Marth is almost op. This change doesn't really affect his play that much though, so I'm not sure. He's the guy in most need of buffs, but whatever.
That particular online match was actually lagless.
And the reason I feel it doesn't benefit him is, all you need is for someone to predict it, and you're basically throwing yourself at them and screaming "GRAB ME, YOU FOOL!" I prefer emergency break, myself.