Out of all the music games I've played, osu is by far my favourite. Probably cause new songs come out all the time (all the anime OP/EDs that I know) and I'm enjoying it much more since I got a bamboo tablet for Christmas.
My username is massi4h. I'm not great at the game like some people I've played with, but it's just so much fun. If you don't like anime, you might like "Nightcore" It's a pretty popular genre and the charts are fun as to play.
If you're not playing with a tablet then you're missing out! also, like Woj said, use z/x for clicking. I didn't know this until after I started playing that chart and realied that it would be impossible otherwise.