For those that think the game play in "normal" is a measurement of the game itself, think again. Heck, even in normal I got caught with my pants down a a couple times and paid for it.
Nightmare gameplay is quite different, and as Komskies alluded to, Hell will be different again. Let alone Inferno!!!!
So here is my brain fart moment:
If you have NOT played through normal mode, don't read this.