I've heard people say it doesn't but everytime I see a nasus play or even when I play him even though I have only trinity force and the rest tank some how I end up beating and out criting adc's or someone like trynd or yi when clearly theyre whole kit is crit if it doesn't then is the big red damage text for crit is false?
It used to. Not anymore.
If it crits it only doubles his base AD, not his stacks. Yes, critting used to double the damage from stacks. 
was back then as essential on him as 
lmfao.
Oh god no, I hope. The guy can melt towers as a full tank already.
I believe it does
It crits additively but it doesn't factor in the base damage.
hell yeah it crits dude
The AA does crit, but the bonusdamage from Q is added after the crit multiplication. For example, you got 150 ad and Q adds 400 damage. A normal Q hit would be 150+400=550damage, a Q crit would be 150X2+400 = 700 damage. All AA-modifiers work that way unless they explicitly state that they can crit in the tooltip.
You can make a custom game, play nasus build crit and test i, just saying...
