TBH I don't care about rhythm games and don't even know most of them but I was introduced to this genre by Gitaroo Man on PS2 and I only liked it for its sense of humor, not because it's a rhythm game or it was even fun to play.
Then I heard about Guitar Hero games but ignored them because they were more complex version of Gitaroo Man without anything "fun" whatsoever. I was playing a real guitar back then and due to how BS it's to play Guitar Hero I didn't like it at all!!!
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This is honestly a BS design to make buttons horizontally lined inside of vertically just like a real guitar. IDK what they were thinking!!!
However I got Guitar Hero 5 and its BS guitar gamepad for free and played it just because it was cool to create your character and play it. I didn't have fun because of its gameplay, it was just "nice" to roleplay as rock star!!!
And then lastly I played Rock Band Unplugged just because you can create your whole band but no one told me you are forced to play the whole band!! I was almost breaking my PSP trying to play the BS game therefore I just threw the game out of the window instead!!! lolol
However best rhythm game I played was Rocksmith 1 because you use a real guitar to play the game.