Ohhh I dunno about that!!
I liked Renegades, until I lost it. Bear in mind every song on it is a cover.
Evil empire has its songs. Admittedly it's not as good as S/t or Battle of LA, but those are two mazing albums, so it would be unfair to say that's it's crap because it's not as good as they are.
As for Audioslave, I wouldn't say they're better or worse than Rage; They're different. i like Soundgarden as well, and Audioslave is quite literally a mix of the two, and I like that mix.