#10. Red Velvet - Happiness
Yeah...there's no way that Red Velvet wouldn't be last on a list like this. I still have nightmares about this song. From the awkward pronunciation of "happiness" to the terrible rapping heard throughout, there was a lot to forget about this debut. There was also the MV and the many issues there. Not much else to say other than thank heavens they turned it quite the ways around.
#9. Super Junior - Twins (Knock Out)
Despite not needing to compare with modern era boy groups, Super Junior 05's debut simply lacked the knock out capability their title claimed. I just don't think "Twins" is that good a song. Unremarkable in all facets, this was only impressive in the sheer number of members, as having 12 members was and still is unusual to see. In retrospect they almost had a fusion element to their early songs (almost like Dreamcatcher but a little more intense) and that's probably why I didn't like their pre-breakout era music.
#8. CSJH - Too Good
Before Mamamoo, there was SPICA. And before SPICA, there was CSJH. Pure vocalist groups can all trace their ancestry to the girls of CSJH The Grace. Their debut video has nothing but powerful voices and closeups to focus on the faces behind the voices. All these girls could sing and would dominate the competition today. Stephanie left and they've basically been dead but Dana's still kicking it today! Or at least, she did a ways back with "Touch You." Oh fuck that was two years ago...