Modern Heavy Metal deviated WAY too far from its roots - s**t doesn't even sound like Rock anymore IMO
Yes there is this "branch" in metal that tends to optimize for the guitar chug, pummeling beats and bass that doesn't have any function but to glue it together.
If you take such a rhythm section separately, you will end up with something really basic. Maybe powerful, but basic. It will not swing or groove that much on its own, the point is to present a solid foundation so guitars/vocals can take the limelight.
The tendency of metal to diverge to this direction during the 80s/90s lead it to today's grid aligned, often programmed MIDI drums.
A real rock and roll band's rhythm section is never flat, they always swing or groove and fluctuate in time, they play organically with eachother, honoring the energy of the live show (there is no R'n'R without live)...it is almost given if a powerful song has 3 choruses, the last one will be faster, more harder (dynamic range) and so on.
Here - Maiden's 1984 hit, but only Harris and McBrain playing. The final song is one of quintessential 80s metal tracks. The rhythm section, on its own, feels like a rock and roll jam
View: http://www.youtube.com/watch?v=0jN3WQGc64U&t=20s