Man, I just played through The Pitt for the first time. Awesome, awesome city design they created. The whole post apocalyptic urban factory setting was done perfectly. Makes me even more interested in what New Vegas will look like.
Also, Stealth Armor + 100 Stealth + Perforator (acquired in The Pitt, its a silenced Assault Rifle with scope) = Holy shat
Before acquiring the Perforator I had to resort to using a gun that would compromise my location to the enemy and surrounding enemies or use the shitty Silenced 10mm. Now I can be real stealthy but the gun still isn't powerful enough to take down really defensive enemies, its really good for headshots + sneak criticals then switching over to a gun that packs a punch (like a shotgun).