I grew to like their redesigns. Amy's I liked from the beginning, but the others had to grow on me. Also, I'm happy that Tails, Knuckles, Amy are going to be playable. After four games where you only played as Sonic, I can definitely say I'm looking forward to this game!
The way I see it, I was never a big fan of Sonic's modern design to begin with but I think the design he has in Sonic boom is better than it was before with the exception of a few quirks. For Sonic, I like the way his quills look a little more natural and are less like cartoon spikes, his arms being blue instead of flesh colored doesn't bother me, and I don't mind the Nathan Drake style scarf thing, my only beef is with the bandages which don't really serve a purpose and honestly I could see Sonic tripping up in them. I like Tails' new design, and Amy's looks a bit closer to Sonic's age and she doesn't have that old fashioned Minnie Mouse dress that is prone to creepy panty shots, so she gets a pass too. Knuckles is the only problem for me, not because he's big, but because his proportions look weird. If he had a body type like Storm it wouldn't be that bad, but the huge torso with the teensy weensy Sonic legs looks weird (for some reason I always imagined Knuckles being strong but more tall and lean, like a Muay Thai fighter or something personally, but that's just me).
Either way, excellent picture! And I still think the Sonic Boom designs look better than Sonic "Eldritch Abomination" Heroes.