Stan Smith (seasons 11-present)

Stanford Leonard Smith is the main protagonist of the adult animated sitcom American Dad! He is voiced by the series' co-creator and executive producer, Seth MacFarlane.

Sadly, he has been flanderized since season 11.

Why He’s Not Our American Dad or a Brave Patriotic Hero of the United States Anymore

 * 1) Similar to two other male leads from Fox's other popular animated sitcoms, Stan became an unfortunate victim of flanderization, as he went from being a  right-wing brave patriot of the USA who still means well as a father and husband into a cowardly, whiny, spoiled, bratty, immature, annoying, unfunny, and a very idiotic man-child.
 * 2) He's basically just the American Dad! version of Peter Griffin (though not as bad) as he acts childish and incompetent, as he seems to treat his family horribly, especially Hayley and Klaus.
 * 3) He is a horrible father, not just an abuser to Steve and Hayley, but a hater on Klaus as he completely tortures him for no reason given at all, other than to advance the plot.
 * 4) He has a strong and unnecessary hatred for Jeff similar to seasons 1-10 as he seems to have learned nothing from the episode "For Whom the Sleigh Bell Tolls" when Jeff saved him from death. He still tends to rip on Jeff for nothing.
 * 5) His hatred for Hayley has gone way too far, up to the point where he disfigures his daughter after causing so much trouble to her.
 * 6) In "Father's Daze", Stan decides to wipe his family's memories so then he could have Father's Day every day. This episode goes to show how much of a sociopath he is as a person in general.
 * 7) He thinks that he can do everything right. In "A Starboy Is Born", when Francine was horribly sick, he said no to taking her to the hospital, thinking he could fix her and make her feel better.
 * 8) In general, he's been a very unfunny character in episodes such as "American Fung" where his antics are supposed to be taken as jokes but come off as tasteless, unfunny and boring.
 * 9) His flanderization got worse midway through season 11 when the show moved to TBS as his flanderization is cranked up to eleven.
 * 10) * Speaking of which, he was at his absolute worst in episodes such as "American Fung" and "The Mural of the Story" where his flanderization met all-time lows as he forgets his wife's anniversary and then locks her up in an asylum and aside from almost getting a lobotomy, Stan does not really receive any punishment for his horrendous behavior in this episode.
 * 11) * Likewise, in "The Mural of the Story", he blows the funds for the mural on a pre-party, ruins the mural by making it look like it was drawn by a preschool student, pins his misdeeds on his own daughter, refuses to tell the truth, and mutilates his daughter’s face.

Redeeming Qualities

 * 1) He was a more likable character in seasons 1-10.
 * 2) He still cares and loves for his family at times.
 * 3) Seth MacFarlane still does an excellent job voicing him.
 * 4) He is still likable in a few episodes and retains his original persona such as the 200th episode.
 * 5) He still has a great character design.
 * 6) He is still very patriotic despite his right-wing attitude being long gone from seasons 1-2 (and by a lesser extent, seasons 3-4).
 * 7) He sometimes does show regret and gets comeuppances such as in "The Mural of the Story", where he apologizes to Hayley and was booed which proves that he won't be a karma houdini entirely.
 * 8) His flanderization at least didn’t hurt the show too much.

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