Might be a bit late to the party, but eh.
My two cents is, what rubs me the wrong way about Dark Pit is that he had so much potential. Like, Uprising has a billion different weapons, and Pit and Dark Pit clearly have differing choices on what weapons they like in game (In scenes seems like Pit uses the Silver Bow or something, Dark Pit uses his Staff/Club/ect) so arguing that it makes sense that they're so similar because they're literally clones of one another holds no weight.
I was actually pretty excited when he got thrown in at the end of Palutena's trailer. I couldn't wait to see the differences between him and pit, with them using a variety of weapons from Uprising that would make them two extremely different characters, albeit with perhaps the same jump and movement physics. I seriously thought it was a no brainier when I saw him, I absolutely didn't expect him to show up to be just an exact clone (sans literally two specials and a final smash) of Pit. It's just a boatload of wasted potential, to me.
But on the flipside, if Sakurai didn't have time to do something like that (he was added last) I'm glad he got in on his own. Kid Icarus did deserve another rep, and shoehorning a Pit clone in Dark Pit was the most efficient decision. Dark Pit sure differentiates himself from Pit in Uprising mannerism and character wise, so I'm not mad he was tossed in.
But seriously, people arguing that he does justifiably differentiate himself from Pit have no idea what's going on.
Just a tad dissapointed. Haven't checked, but It'd be nice if their customs were way different from one another's.