i quite like opeth actually, their accoustic songs anyway, their metal stuff, old quickly, yeah i agree.
in fact ive been thinking about most newer bands that i listen to that havent got old quickly, the only one i can actually think of is symphony X. Alot of new bands to me seem to have something missing, alot of the times, its vocals, and the melodies, which is fantastic in X.
As a guitarist, i allways used to put the guitar melodies before the guitar counterparts, but listening to old Dio stuff, and the new symphony X stuff, just shows me how powerfull it is if you get it just right.
also with older bands they all sounded very different, you could tell your zeppelins from your sabbaths, and your sabbaths from your Rainbows, etc.
i sound like an old bastard after this, i do listen to alot of new material, but alot of the newer bands i listen to are new and have only a debut out prehaps.
Damnation and Blackwater Park are all I can stomach...but they're still very repetative.