Well, yes, it is music as we know it, ie.. just normal music theory, I think the only reason it can seem odd is if you had never done any music theory. Its stops you having to make random exceptions for certain keys, so that in all keys you have all notes represented - if you are reading sheet music how would you represent a 'normal' a# vs a? If you are changing it you would put a sharp in front of note, but if every a was either an a or a#, it would be tiring to read without going through it first.
If you don't read music, then I agree it can seem a bit odd, but then if you don't read music, why does it matter. I don't read greek and it kind of looks all greek to me!