Vapereon; A worse Gyarados, which in turn is a worse Kyogre
Jolteon; Will likely be outclassed by Magnezone and Electrivire, even if you don't have the legendary electrics.
Flareon; A blast burn Charizard is better, as well as the legendaries
Umbreon; Sadly irrelevant due to Niantics CP formula and the non existant defense meta
Espeon. Best psychic attacker except Mewtwo, but psychic attackers only have a small number of uses
Leafeon; Likely outclassed by Tangrowth. Probably on par with Aloha Exeggcutor
Glaceon; Mamoswine will be stronger and easy to obtain, unless they give Mamoswine lacklusture moves
Sylveon; Should have good stats with Niantics current formula, with good bulk and an attack in the low 200's. Might be the most useful eevolution considering the small number of good fairy pokemon.
Overall the eevolutions are cute but don't have much use in the meta. Is this correct?