Rhythim games :3

Making another thread because the old one was archived. So let's talk rhythim games! I know a few people on here already who play rhythim games so this thread is also for you. Probably the most well known rhythim games out there are the Just Dance, Rock Band and Guitar Hero game series, which really popularized the genre for the general public. There's tons more out there though, with the most popular ones on the PC arguably being osu! and Audiosurf. On Steam more and more rhythim games are popping up and even our beloved Game Freak has joined the fray with Harmoknight in 2012 and what to think of the Hatsune Miku games on the PS and 3DS? It's pretty obvious that rhythim games are an up and coming genre that will probably become even more popular in the future, seeing how important a part music plays (HAHA GET IT) in all cultures of modern society. Alright, I went on a bit of a rant there so let's just say rhythim games are cool and fun.
Personally I've only played osu! and Audiosurf. osu! in particular has a great appeal to anime fans from all over the world. The community is very active and there's even an official osu! World Cup that's held every year. You can make your own servers and play against friends or strangers, there's in game chats and of course the official forum. osu! is accessible in the way that's it's free to play and you don't have buy any special equipment to play it at the highest level either, as you can just use your mouse. Unfortunately, you can only play songs that other people (or yourself) have made a beatmap of, which means you're limited in what you can play. If you want to play your favorite song but no one has mapped it yet, you either have to do it yourself or you're outta luck. I also feel there's a very steep difficulty curve which makes it hard for players to just jump and start playing.
Audiosurf on the other hand isn't like that at all. While you do have to buy the game for $10 in order to play, the game itself offers way more different songs than osu!. Actually, you can play literally every mp3 file on Audiosurf, giving it endless levels to play. The gameplay itself is also somewhat easier to get into, making it, imo, a better game to get into if you're new to rhythim games. On the downside, there's little to no community behind as every can just select an mp3 file and start, instead of players having to make the levels themselves. There is a leaderboard for most songs, but you can't interact with others through the game at all as far as I know. If you like having social interaction in your games, you'll probably be disappointed with Audiosurf.
Wow, I feel like I just wrote a script to a YT video titled "osu! VS Audiosurf", no idea why made this OP so detailed lol
What rhythim games have you played? What are your favorites? What do you look for in a rhythim game? Discuss >_>