Lol I'm pretty sure SHDF is still there, especially with the slightly increased angle up (it's not Melee tipper but it's **** close). Also, Shaya, have you considered the difficulty of it may be due to your buffer setting? Wait, can the PAL set even set buffers atm?Gimme my sh double fair, with some time inbetween to bait a god **** air dodge to boot ~_~.
Also Shaya...vBrawl Marth horizontal combo ability was based on Dancing Blade (I know he has other **** but both you and I know practicality-wise every string ended in DB)...Brawl+ is almost the same in that regard. His horizontal comboing can't swat people from one side to another like Melee unless your opponent can't tech, but it gets the **** done most of the time.
Unimpressive, perhaps compared to Squirtle Knight (lol), but as you said, Brawl (in general) Marth excels in juggling and that's how it should be. The beta set reduces damage and that in a way gives Marth more combo ability as opponent's won't fly away as quickly. However it still seems to be strong in juggling, and not horizontal comboing as you've observed from past B+ sets.
I wouldn't mind dash attack having a use...considering it is by far one of the worst moves in the game and is unsafe on shield, even with the massive shieldstun overhaul in Brawl+ to cater to more offensive play.