It's hard to believe this song is already a month old, but it came out at the wrong time for me. The end of every month has exams, and then I had spring break, and then I had to get back into studying mode. It's a shame it took me a long time to review this because it is one of my favorite debut songs over the past couple of years.
"Mo Mo Mo" is a great song because it is an upbeat song that keeps the goodness throughout the whole song. In songs such as this, the chorus could be the only interesting part of the song while the verses are ignored; however, the verses retain the same great instrumental that the chorus has, but only just feels a little slower than the chorus. The transitions to the chorus don't seem to jump out of left field like what happens in a lot of songs. This structure keeps me interested in the whole songs instead of waiting for chorus to come around.
"Mo Mo Mo" has one major flaw -- the unneeded rap section. It's not just because I think rap is the lowest form of music, it's because it had no place in the song, as the song didn't even need the rap. The rap comes during the bridge of the song, which means that producers could have done anything. I would have preferred some vocalfagging over the out-of-place rap. Exy's rapping works much better in a song like "Catch Me" as opposed to "Mo Mo Mo". Aside from that, there's nothing in the song that I truly dislike.
The MV is your typical Kpop MV, which means that it features a high budget and a lot of attractive girls. I had to watch the MV a few times to pick my favorite members visually...after checking to see when the members were born. So far, Eunseo and Xuan Yi are my favorites.
Overall, Cosmic Girls are off to a good start. Now I just have to hope Starship doesn't fuck it up.