#2
supposdely very good as long as u mean like napalm detah heavy. if u mean like metallica, id jst go for the OD1
#5
The noise gate on mine seems fine. You can get a real balls out metal sound with an Uber the pulverize setting is very good. You can get tones simular to new Metallica, Trivium, God Forbid, Killswitch etc. If you're after an old Metallica tone or something simular then don't bother with the Uber.
My gear:

Gibson Gothic Flying V
Engl Screamer Combo
Maxon OD-9
Squier 10w amp