Vayne Solidor....is the single worst villian in FF.
To me he is ultimatly boring. He never does anything, you just get a load of aiships chasing you ny time you get anywhere near Nethicite. I think so far ive only seen him once and that was (SPOILER) when he became leader of some place, cant remember the name, possibly dalmasca? and im up to Giruvigen.

He is pointless. he does nothing. I bet hes gonna be one of these bosses to randomly appear at the end spouting his mouth off at me.

I thought Seymour was a pretty good villian personally. he was deranged, i like that in my villians!

Sephy....this arguement is gonna go on forever, i personally like him. he was effective, Squareenix needed a villain, they got one, he worked.
Dont believe hes the greatest think since sliced bread though!