At first, I didn't have high expectations because they were an idol band.

I really liked the vivid performance that the driver made possible.
It's really cool to see them sweating and playing live on stage. It's even more trustworthy because many of the songs were written and composed by the members themselves.
So I liked the simple, unpretentious lyrics. The richness of the instrumental sounds over the mechanical ones suited my taste.
The genres are diverse, from ballads to rock and pop, so you won't get bored.
I regretted passing it off as idol music.