Well, this character’s history is something worth noting of…
SF4 Arcade launches - Seth is faced with criticism for being a generic character that carries on the tradition of being a insanely hard boss character.
SF4 Home Edition launches: Same as above and Seth is widely despised and unpopular as a playable character.
SF4 mid span: Poongko takes on Seth as a minor alt.
SSF4 launch: Seth is used slightly more often in the hands of top players such as Arturo Sanchez.
SSF4 mid span: Seth is now liked among the top community.
SSF4 AE: Seth defeats Daigo and gains widespread love from all SF players around the globe.
SSF4 2012: Kazunoko sticks with Seth, and Seth is now a widely used character in Japan.
SSF4 2012/2013: Seth is hailed as the mightiest character in SSF4, and taking the Tier 1 spot.