I'm a Pit main and I can tell you he's far from broken. People aren't use to the game or to him yet. He's newb friendly is all.
His kill moves are relatively weaker then others. They don't reliably KO until above 150%.
Pit's up-B is his biggest blessing, and his largest curse. The fact that it isn't an attack, and that it's slow makes it very easy to gimp if you build the courage to go after him. Don't say that this isn't a problem because Pit can glide. Gliding has the same troubles that Up-B has.
His arrows aren't spammable if you keep approaching. He'll only get one arrow on you before it's not safe for him to use them.
Pit's aerials are easily worked around. They have short reach vertically, and horizontally, plus they come out slow.
The side-B is beat by just full jumping, or rolling behind. It's not too hard.