I think it's more the fact that Jax is countered by a single item that makes him worse off than others ;p
But Dekar! No one buys SoTD besides ******s! Who would possibly use that to counter Jax?
I'm fairly certain in the future, more people will QQ about Vayne after they realize that she can build triforce + AS and then just stack defense items on her.
and still do a ton of damage with her W and Q/Triforce procs
also Vayne is pretty good in lane vs people who don't have a ranged hard cc. she can trade harass with other ranged carries all day and come out on top
Well, depends on what carries we are talking about.
Corki ****s on her in lane imo. His Q range is large enough that he can hit her with it and also be outside her range if she tumbles at him head on. This means she has to be significantly faster than him (would have to start off boots) to be able to hit him after a Q or to weave circles around him. But the problem with starting boots is that Corki can go Doran blade and not give a ****. You have no poke at him, so he can afford to get in front of the lane in the very early levels and come out on top if the two of you clash. Damage and Health advantage, along with having a poke, allows him to overall win the lane.
Now if both champs start off with Doran blade, it is a lot closer but still a bit in his favor. The downside is that you have to still avoid his Q to come out on top, but being slower hurts your chances for avoiding it and also getting in a tumble hit.