I know this game is popular and I can sort of see why (the puzzle aspect), but this game has always been boring to me.
I would say the gameplay for this game is pretty good considering it's Tetris, and you can set high scores in the game too (even though most players couldn't care less about how many points they get unless you need points to advance to the next level; they just play the game). I'd rate the sound the best score of anything in this game. I do enjoy listening to the music it has while playing it.
Overall, I find the game's main objective to be boring while its redeeming quality is the music, and to some extent, the gameplay. I rate it 4/10.