Didn't know Anthrax got a new singer.... WHY!? John Bush was great.
For Megadeth: Youthanasia grew on me after a while, some of it anyway. I even liked some of Risk, but only some... As far as their new album is concerned, it probably will have elements of both Youthanasia and Rust In Peace, but like everything they've been doing, it will actually be different altogether. They're a progressive metal band, and that's the way it works.
I would have to agree about Metallica, I do respect them to an extent for bringing life to the thrash metal genre, but they don't deserve the credit they get for being one of "TEH GR8EST BANDS EVRRRRR".