would like to second whoever said Queens of the Stone Age, btw. In the 90's, they would have been middle of the pack. But they're pretty much the only band I get excited to hear about coming with a new record.
Middle of the pack? I don't know. IMO All of their albums are really solid and I think hold up, regardless of the era.
Anyway, yes good rock music is harder to find these days. The good stuff is not force fed to us like it used to be (how fortunate we were in the 90s!). However, frequenting messageboards, using Pandora, and going to SXSW has led me to discover countless great rock bands.
It sounds like the OP is looking for "hard" rock bands. Bands like Modest Mouse and Built to Spill, although great bands, don't really fit here.
My short list?
Queens of the Stone Age
The Mars Volta (2001-2008)