5/5 gameplay and song selection. 0/5 monetization. There's plenty of complaints about the ingame store already, but I'll add that it also steals your IAP gems. There's a pay to continue popup when you miss a beat. It's right where your fingers are. No confirmation when you accidently hit it.

[New Update] For casual players, try to only gold medal (5 stars+) the songs you love. It'll keep the game enjoyable when you eventually grind for deluxe songs.