Pop'n Music is a rhythm game released for the Nintendo Wii. The franchise was never released outside Japan, but Konami had a couple of attempts to localize the series. Their first one was to make a game similar to Pop'n Music called Beat'n Groovy which received negative reviews. Their second (and final) attempt was to make a complete reboot the the original Japanese franchise, and they failed badly.
Why It Sucks
The gameplay is nothing like the original franchise.
In the original series the game uses 9 buttons that you had to press to hit the notes but in this it use motion controls that you have swing the Wiimote Down (↓), Left (←) or Right (→) to hit the notes.
The designs for the character are bad. They're a fusion between the original designs and a Mii.
Also in the US version Poet's halo was removed because of religious references.
Most of the songs are licenses with only 10 songs being originals.