After a long time of messing around with Falco, it's obvious that he's lost almost all of his strong options from Brawl, especially with the added frames to Side Smashes, and the fact Up Smash's first hit can knock them out of the follow up, it seems Sakurai was really experimenting here.
Playing him, you really start to miss DACUS, in fact, you start to miss most of his smashes in the previous versions.
But, it feels as if he's become a "Jabber" the problem arises against other "Jabbers" aka any character with fast jabs like
can pretty much negate your "Triple A Spin" by throwing in 1 jab by the time first 2 has launched, makes no sense. However, against slow jabs, or in general sword fighters, he can catch him in jab traps, such as jumping behind them with an Nair and then jabbing to rack up damage - Although a bit risky.
I'll honestly believe Falco had the roughest transaction from Brawl to SSB4, especially considering how UpSmash and SideSmash were butchered.
Alas, he awaits in mid tier awaiting some sort of buff, Keitaro does have some success with him, but it seems more like actual player skill, than the character, I guess that's attachment for ya.