Incandenza, I'm sorry if I somehow offended you. Certainly, I wouldn't want to get on the bad side of one of TSM's most respected posters.
But yes, you should see Mastodon, just for fun; keep in mind though, if you stand anywhere but in back, you will probably have to go out of your way not to get hit by any sweaty nu-metal kids dancing and moshing around like they own the place. I learned this when I saw Andrew W.K. live and I had some metalhead douche bump into me every 3.5 seconds during the two awful opening acts. However, the experience did provide me with the image of a lone nu-metal kid wildly moshing to the first band that played while everyone else there was standing there doing nothing. Perhaps you'd have to have to have been there to understand, but it was a moment for the ages.