But at their core; they are both fast, bulky, pure-electric, volt switching, ice-flinging assholes that are FAR too underused in a metagame that is tailor-made for them to dominate. If you run Jolteon, you are part of the problem. Get a real electric quadruped.
I completely disagree with you. Jolteon is an excellent pokemon. Why care more about bulk than speed when we're talking about a pokemon who's role is to hit fast and flee?
Lets compare stats shall we?
Raikou has a lot more bulk, especially when it comes to hp. He can take more physical hits than Jolteon. That much is true. When it comes to spdef, Raikou's is SLIGHTLY higher, but not really too much, again the HP is what makes the difference here.
When it comes to spatk, Raikou has a TINY bit more than Jolteon. Ok so far so good. But here's the thing, Jolteon has that outstanding 130 base speed.
That, and just that, seals the deal.
Jolteon can outspeed almost ANYTHING. And that includes two very important pokemon that Raikou does not outspeed: Starmie and Greninja. He also outspeeds Noivern, jolly talonflame (if that's a thing), Alakazam and Weavile, among others.
The ability to outspeed Greninja is the most important in my opinion.
I'm not saying Jolteon is the only viable option, cause it's not, Raikou has other traits that can make you decide whether to pick him or not. But to say people should stop using Jolteon, is plain dumb in my humble opinion.