I guess it all comes down to how each of us responds to any given episode. I commented recently in another thread I was quite bemused at the level of vitriol heaped on this particular segment by fandom. I really wouldn't have thought of TAF in this manner pre-internet.
Regardless, TAF remains one of my favourite entries from S1 despite the eloquent arguments presented by previous posters. While I certainly understand the rationale behind many of the criticisms, I can still easily dismiss them and enjoy the show completely unburdened - like many other episodes from across the franchise. For me, it's all about the "vibe".
Personally, I find it absolutely astonishing TAF would come bottom in a grading of TOS episodes behind the likes of Spock's Brain, And The Children Shall Lead, The Way To Eden etc.