Kanno, with all due respect (and much respect is due), it seems you're reading way too far into seymour in order to say he's a lame villain, completely disreguarding that most FF villains, especially in the 2d generation, are alot less developed and have very few motivations at all for being a villain. You omit them all except for Kefka, for whom you, again, read way too far into, this time for the sake of creating some synthetic significance for.
On another matter, I think the reason why most people here don't like Seymour, even moreso than his annoyingness, is because he's in a Final Fantasy that has very good graphics. And according to many people on this site, good graphics is a terrible, terrible thing. I feel sorry for them.