I guess it depends. I generally had fairly decent experiences with the open source drivers, but those have the issue that you can't do any remotely serious 3D with them: pretty much the most they're good for is desktop composition, and there's unfortunately no support for WebGL (which allows for significantly better experience in Google Maps these days). But they are nice for fast wake times from sleep mode (~3-5 seconds vs. ~20-30 seconds for proprietary drivers).AMD+linux=bad times usually(Though, not always). Still, you are correct. The GTX 650 was way over priced when it came out, and I honestly regret buying one instead of, say, a 7750 or 7770 simply due to the price I paid.
In general, though, I strongly prefer nVidia's Linux support for the desktop, though I use Linux on my personal machines much less these days.