Prog metal?!??

It's progressive metal if you can't stand to listen to it for more than 2 minutes straight.

See: Dream Theater

Seriously, the point in progressive is to do over-the-top, sometimes masturbatory things with your songs. Unusual structures, long playing time, weird solos, sections that lead nowhere, etc. That's at least the way I see it.
 
Generally 'Progressive Rock/Metal' are genres that take normal rock/metal and add to it... or at least that was the starting definition. The songs are hardly blatantly monotonous, and generally very dynamic... there's alot happening, alot of sections, different approaches all during the one track.