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I think what really bugs me about every Eeveelution after the first three is that all of them except maybe Sylveon completely drop Eevee's collar. Flareon, Vaporeon, and Jolteon all did something with it, altering its design to suit their element.
Then we get to Espeon and Umbreon, who definitely look nice, but also look less like evolutions from Eevee's design. Unfortunately, they seem to have become the new basis for how Eeveelutions look, as Leafeon and Glaceon continued this. Unlike the previous two, however, Leafeon and Glaceon's designs weren't solid enough on their own, and seem a bit "bare" as a result.
I think they realized their mistake with Sylveon by giving it the bow and ribbons around the neck, though whether they'll take up that design scheme again won't be known until we get another Eeveelution.