So this weekend I find my slef with a fair amount of cash to burn and a few friends coming up for merryment. I have played Guitar Hero a lot and really fancy getting Rock Band (or 2, whatever) and... does anyone play it? or have played it?

It as fun as I think it would be, is it worth the cost of the package and game, should I wait till after Xmas and get it after I have played Fallout 3 to the point after which it is no longer boring as fuck and becomes really good?