Too repetitive.
I'm actually rather disappointed in this season. I felt like I was watching the same episode over and over again, just with different characters. The beginning was good, but once the "duet episodes" started, that's where it got boring for me. Once the duets were done, it got good again, but getting there was tedious. It was nice to see some character development and learn a bit more about them, yes, but what was going to happen got a bit predictable. The format was the same.
A little unrelated, but I really wish they'd drop the English in the lyrics, it's so cringy most of the time.
This is the first time that I have to "force" myself to finish it (which, as of writing this, I still haven't done, and I started it when it first got out a year ago. 3 more episodes to go!) and sometimes I'd go MONTHS before watching another episode, while the other seasons I was just completely addicted and wanted to watch it all in one go.