Whilst feeling quite empty (i.e. lack of quests), the ending definitely was worth the trip.
This is where the lone wanderer comes in as s/he gets a distress signal from an escapee slaver from The Pitt named Wernher, requesting you to enter The Pitt to locate a cure for this radiated disease. This disease turns humans to a monstrous fiend known as the Trog; a freak-a-zoid with tremendous strength and agility and having very little humanity intact. Of course the transformation is not a pleasant ride and affects all that lingers around the waters. Basically everyone save, of course, the raiders.
So The Pitt introduces you new locals, weapons and armour, character enhancements in the form of perks and four achievements. A straight forward adventure where you get the see the industrial settlement in its fullest glory – billowing smoke arises from vast chimneys giving you that 'choking' feeling; slaves hammering away at rock / metal, all under the supervision of the raiders and smelt welders dancing with death among vast quantities of molten metal and radiation. So, as you can imagine, the slaves needs your assistance otherwise they are all a good candidate turning into a Trog.
Yet, the entire location does feel empty. Not empty in the sense of there's nothing there (as you always get to see the raiders / slaves interaction); empty that there's a lot of wandering around. It feels like there's a lack of missions to 'fill up' this area – other words, wasn't exactly concentrated enough. I spend a lot of time just wandering around from one smoked filled area to another, in search of the cure (and watching slavers getting bashed by their masters, or shot even). Granted though, there were times I just stood there looking at the slaves wiping their brows due to the intense heat, wishing their death away sooner than later.
Heck there's even one area that's dedicated for finding ingots for one of the raiders yet at least there are some critters and a few 'small' surprises along the way. However I do hope you get the idea of 'wasted space' by now. But do spend some time hunting them as you get to see some of the best sights this DLC can offer – and collect 100 scores you an achievement plus some very cool gear.
The expected gameplay length is around four to five hours. For me, I knocked it off around the six hours mark, only because I actually located all 100 ingots. However, as 'empty' as it feels (i.e. lots of wandering around), the moral choices in this DLC is the best I have encountered in Fallout 3 thus far (this is not including the DLC Broken Steel, Mothership Zeta and Point Lookout as I haven't played them yet). It was so controversial that before 'making that decision', I actually exited the game for a while just pondering the outcome. And because of that made this DLC memorable enough, otherwise it's just another chink in the armour.