Eh, they made it easier for sure. It's not a faceroll though. You still have to do the encounters properly and know what you're doing, or you will wipe. For reference, a few weeks back I did a BWD run with some guildies and some PuGs on my DK. We had a few wipes, and when we got to Nef we had to replace the tank after three wipes. He just didn't have the dodge/parry/health or whatever to tank the fight. After we replaced him with another guildie, we got the fight down in a couple tries. We had two or three people in that run who had never been to the raid before, and my sorry butt who had never raided on a melee toon before. Took me about 30 seconds to figure out what the frack I was supposed to do to chain Magmaw's head lol.
In comparison, this weekend I did all three raids in two different runs with my guild. The only wipe happened when someone accidentally pulled Al'akir before we were ready. There might have been one PuG in the group, I don't recall. It was mostly guildies though.
My point is, if you know what you're doing, the fights are a lot easier. Most of the challenge is gone, but not all. The people who were wiping on Magmaw and Halfus before 4.2 are still going to struggle, they're just going to progress faster now than they would have if the content hadn't been nerfed.