I've seen these bands live (Not any specific genre, just who I've seen live):
-Disturbed
-Suicide Silence (The only chance I got to see Mitch Lucker =\)
-Rammstein
-Green Day
-Motionless in White
-Black Veil Brides (I didn't go to see them; I remember when he got boo'ed off stage and ran out crying)
-William Control
-Saving Evan (Small local band)
-A.F.I
-Godsmack
-Megadeth
-Trivium
-Linkin Park
I didn't see all these bands by choice but a lot were during festivals.. But most did not disappoint me.