If we wanna argue which FE characters are better, this is my personal, slightly biased ranking:
Ike Marth Lucina Corrin Robin Roy
Ike: Ike is still Ike; great grabs and combos out of them, great kill power, scary range, and a now buffed F-Air and F-Smash as if he couldn't kill early enough. Still kicking ass. Still not doling out sympathy.
Marth: 70% kills as Marth are popping up all over the place after the buffs to his aerials/tipper hitboxes. With those buffs comes a couple more ways to combo into those tippers, as well as some improved reliability on the confirms that already existed. Range buffs benefit his key edgeguarding moves, but he still won't get many easy offstage kills without tippers. That said, those tippers are EXTREMELY lethal. Don't fuck with 'em.
Lucina: The damage/range buffs were very generous and have turned Lucina from a silly warrior waifu into a terrifying offstage threat. Few characters can weave around the now-disgusting coverage of her specials/aerials. She still kinda lacks onstage kill power before 100% (barring a shield break), but has kill confirms, high coverage, and a surprising amount of moves that are safe on shield.
Corrin: Now that we've figured out exactly what Corrin does (and doesn't do), many of us have started to find that he is a character that relies on zoning and, when that fails, some gimmicks. Play his game and you will lose. However he has a very tough time handling pressure and, outside of a couple moves, has a less than impressive close-range game which includes a poor negative state. Will lose to aggressive characters/players who find a way around his defenses.
Robin: Robin is a fairly similar character to Corrin but trades some tools for a little extra recovery and kill power. However those tools (such as a Counter and some quick-to-act-out-of aerials) were key to fending off the threat of many characters and Thunder/Arcfire tomes often do little to nothing to compensate. Still a great character, but definitely requires some patience.
Roy: Roy is still considered the worst, as he is still cursed by the same weaknesses he had before. That said the buffs made for additional improvements to his already-great pressure/tech-chasing game. He's still got use, and is still fun for the impulsive and impatient.