One way to hold this word: the little sentence feel good has been picked up whole and parked in front of a noun. So a feel-good film is a film that makes you feel good, and a feel-good moment is a moment that does. The word always describes the effect something is meant to have on people, never how good the thing is. Point it at one person in a cinema and you get the film sense; point it at a whole country and you get the feel-good factor.
可以想成 feel good（覺得舒服）這句小句子被整個抬起來，放到名詞前面。所以 a feel-good film 就是「一部讓你 feel good 的電影」，a feel-good moment 就是「一個讓你 feel good 的時刻」。這個字描述的一直是「它想在人身上造成什麼效果」，不是東西本身好不好。把這個效果指向戲院裡的一個人，就是電影那個用法；指向一整個國家的人，就是 feel-good factor。