A few years ago I also thought they were overpriced.. know not so much, depending on when you buy.
If you buy a Macbook they month after it has been released, I don't think it's that overpriced... you also get some stuff that are not easy to get on other machines.
I don't think there are many laptops out there with faster SSD than the rMBP, the high res screen comes standard, the form factors is nearly perfect, the trackpad is miles away from windows machines and thunderbolt is also much better than USB 3, although the peripherals are usually more expensive. And made of aluminium.
Now, go to the windows world: there are not may con / prosumer machines which can follow the rMBP on all those topics. On the professional world, there may be some choices, but at higher prices. At the end, it's difficult to find a Windows machine with the same target than the rMBP. And then comes the fact that Windows machines run Windows, which isn't a choice for me, I simply don't like it for home use.
However, right now, I don't think I'd buy a new rMBP unless I really needed it. Seeing how the new Dell XPS 13 looks like, I hope Apple brings some "innovation" into the rMBP line.. or new Retina Airs. Apples needs to update the machines to keep ahead of all the Winintel machines, ideally for me: a bit lighter and compact, 4K screen, some speed increase and same price or lower.. you have a winner there!