There are a lot of bad SD cards out there. They go bad in all kinds of devices and in every type of cell phone, camera etc.
This is true -- SD card failure is not LIMITED to the S3. Although, personally, while I've had them fail on PCs (probably due to a lot of insertion and removal that eventually wears out the contacts), I've NOT had them fail in any of my cameras or other phones -- just the S3.
The S3 doesn't have any particular issue with SD cards.
Well, I'm on my THIRD -- and the first two BOTH fried their SD cards. Different make and model cards, both from reputable sources (not cheap junk bought on eBay). So, I'm batting a 2/3 failure rate on S3s -- and of all the smartphones I've owned (and that has been several), the S3 is the ONLY phone that has trashed SD cards. So, YES, it does have an issue with SD cards.
Is it ALONE in that, probably not -- but to deny it even HAS an SD card problem is to call everyone who has reported such a problem here and on other forums -- liars. And that is simply wrong to do that.
They suck for reliability in general across the board.
While they are certainly NOT as reliable as other storage media, once again, the ONLY portable device I have owned that has problems with SD cards is the S3.
Consider going with cloud storage.
That's like saying if my car's engine keeps stalling out on the way home from work, then take the bus! NOT a way to address solving the problem -- just an way of ignoring it.