Unless you're a Korea Player and have been playing professionally on mouse heavy games for years now, there is no way that someone could do well on Osu a few tries in. Osu really helps you realize how little control over the mouse you actually have and really helps improve that with at least a month play. Then you transfer your skills gain from Osu to other PC games or become an Osu Try-hard like Talon and start using a Tablet.