I don’t have access to Blizzard’s data to know whether or not LFR is successful. I suspect it is, and I have some personal examples to back this claim.
First, my guild has stopped raiding. While it’s possible that this was partly due to people not caring about Dragon Soul as much after seeing it in LFR, this is also the reason why I can thank LFR. I’m unable to raid normal mode currently, but at least I’ve seen it in LFR. Of course, the same can be said about Mooglegem and our other raiders.
The better story, however, is a friend of mine in a 5-man guild. He plays every Friday night with his small guild of close friends. They don’t want to recruit people they don’t know, they don’t want to merge with another guild, but they don’t want to leave their guild. Many hardcore WoW players might find this odd, but I don’t think it’s such a rare scenario. He had never raided before, and I told him about LFR.
Last weekend he ran LFR for the first time. While it can seem very easy for those who have done normal mode, it was exciting for him and he was focused the whole time on his role, not even having the time to look around and enjoy the scenery. I’m sure as he continues to run LFR, he’ll become accustomed to it and get the chance to look at the detail and enjoy the encounters.
And he even won Vishanka, Jaws of the Earth.