Maiden. Slayer. High on Fire. (DDDDDDDDDD) Melvins. (MELVINS!!!!) Trash Talk. [oh, and QOTSA] are the only things worth seeing. The rest is just your usual Soundwave deal, being a scene-kid wet-dream-fest.
I don't think that a big event like Soundwave would suit Trash Talk, either. Even though their sets are full of energy and what-have-you, Hardcore Punk is just more suited for those smaller venues.
EDIT: Oh, and I forgot Kylesa. Awesome Sludge band.