True but I would want one purely for the feel/ergonomics and aesthetics of the case.
Then let it be as thou has said

True but I would want one purely for the feel/ergonomics and aesthetics of the case.
Do you have a slightly misaligned screen protector that's covering part of the button?
I've just took the screen protector off and it's only made a little bit of difference, it's still clicking about as loud as a mouse button and still doesn't feel fully right. The 1st GS2 I had was exactly the same and I sent it back for that reason, the 2nd one I had the button seemed fine on it however the camera was installed upside down on it... Now this is the 3rd device and it pretty much just feels like the 1st one all over again.
I just don't think it's normal for the button to be clicking so loud.
I can hear the click on mine but I wouldn't say it's loud, just audible enough to make me aware it's been pressed. If I were you, I'd pop into a phone shop and press the button on a galaxy S or S2 to compare and see if there's a significant difference.
If I click the very right hand side of the button, that's when it makes the really loud clicking noise and feels a lot tougher to press in.
Cheers