I kinda don't mind that some evolves take crazy amounts of candy and some don't provided that those evolves actually have good stats and movesets. If Jolteon/Vaporeon/Flareon had kinda crappy movesets I'd possibly be a bit less salty about it but outside of a specific set of pokemon you're just wasting your time trying to build them because they don't have the raw CP, they don't have the movesets and they don't have a reasonable discount to counteract that.
Nidoking, though, I think he can be really good if he rolls good on his moveset.