Explicitly: You didn't like them, whether it was only for a day, a week, or years, but regardless you now enjoy them?
I'm not talking about songs that you felt were a bit 'meh' either. I mean, you would actually skip this song as soon as it popped up on your shuffle!
Recently, I've kindled a love for RED LINE ~for TA~. It's taken me years to enjoy this song. I used to consider it to be one of the least outstanding album enders. It's one of those songs that I believe has an instant (and very Ayu) hook about it, but Ayu has so many songs reminiscent of it, that I don't think I ever really let it have a chance.
crossroad is another one that has needed a few years to grow on me. Now I think it is one of the best songs on Love songs! I believe this was a casualty of Ayu's lead up to her 50th single. It was probably the most disappointing single to me, only having one A-side and then a cover. I never considered it 'strong' enough to be able to carry such an important single by its own self. Now I'm eating my own words.
In terms of shortness, Melody is one that definitely comes to mind. A few months ago, when we received those low quality previews, the first words that came into my mind regarding Melody was,
"Oh no. Not another one of
these!!!!!!"
*insert beloved, Replace, call, Letter and Sweet Season*
(disclaimer: I actually enjoy most of these songs, especially Sweet Season. I just thought that she had really worn these types out

).
I was much more enthused by Song 4 u and Missing. Especially Missing. However, when the mini-album was released I instantly enjoyed Melody (this is why we can't believe previews haha). It even became my favourite off LOVE.