I've done every wing every week in PUG groups through either Open Raid or oQueue. So far I've only had two groups not finish a wing, both times on Galakras. Every other group has ranged from good to pro.
I'd like to get into a Flex guild just so I have a regular group of people to do it with instead of being in a new PUG every week, but so far even doing it in PUG groups is sooo much better than LFR ever was. There is just something about playing with a coordinated group - that has the power to enforce a standard of conduct and performance - that is so much better than the alternative.