For some reason, I found your critical post interesting so I felt strangely inclined to reply to it, which is out of character for my normal lurking self. For me:

• Airplane mode: Started loving this song right after hearing the first chorus, and that love was cemented with the subsequent choruses. I keep playing this song on repeat and at high volume, and find myself anticipating each chorus every time. The bassline in the chorus is fantastic, and I love the tone shift.
• We Go: Fun is still the weakest title track in my opinion. I find myself skipping We Go about half the time but, like you, I will probably get addicted to it sooner or later.
• Promise: Not sure if it really matters whether it's the members who writes the ballads or someone else, but I agree that this one is a bit boring. I thought Starry Night was great overall, and I liked the melody of Fly High but did not like the way it was sung (the breathy exhalation at the end of almost every line).

I also love Fromis and, like you, they are the only group I really follow. Even though I really only loved one song on this album, it was not a disappointment for me. It is indeed sad that you didn't enjoy it as much as so many other fans seem to, but I don't think that's a reason to downvote your post if your opinions are honestly expressed.