The only thing I don't like about the Pitt was the Arena. It was crazy easy to me, so easy that I reloaded to the start of the pit fights to a higher difficulty setting. I wish that there were more fights, like Oblivion. As for battling in there, I take one Buffout, one Rad X, and go at it with Spiked Knuckles through the entire dealio.
I found the Pitt really hard, but I get the feeling it must have been due to Mods making stuff tougher.
I really liked the Pitt and I would`ve liked it to be even harder actually. I thought it was a little too easy for a slave to wander around. I feel I should`ve been stopped several times and even kicked around a bit for not working. I really liked the difficulty decisions towards the end you had to make that gave bad karma either way. Very realistic as often in life there are only greys, no obvious good or bad - And yet you still must make a decision.
I find deleting karma notifications so I can`t see it makes it much easier to make decisions (like real life) without some angel\devil on my shoulder saying "You just did good- You just did bad!" I wish FO3 had hidden the Karma thing by default personally.