Who do you blame more for how badly Cool World turned out, Frank Mancuso Jr. or Kim Basinger?
Frank Mancuso Jr. hired several yes men to heavily rewrite Cool World behind Ralph Bakshi's back because at the time, he was getting bored with producing horror movies. On the other hand, it was Kim Basinger who is likely the reason why Cool World got so watered down (Ralph Bakshi had intended Cool World to be an R-rated, erotic horror movie) and even more tonally inconsistent, since she wanted (midway through production mind you) it to be something that she could personally show to sick hospital children. She's also the reason why there's that "big lipped alligator moment"-like scene of her while in the real world singing in front of Frank Sinatra Jr. Keep in mind that this was right after Kim had done that movie The Marrying Man, and she was still in the mindset that she could legitimately make it as a singer.
http://reviews-to-view.tumblr.com/post/42711796193/terrys-reviews-cool-world
https://web.archive.org/web/20151106021642/https://www.amc.com/movie/1992/Cool+World