Except for the fact that these are certified, and guaranteed to work exactly as advertised. So when every one else can run an app fine, and this one phone cannot, it's not the apps fault, it is a faulty phone, therefore qualifying for another phone to be sent out.
It's apparently not just one phone though. It's 5. I seriously doubt anyone would see 5 totally stock phones of any make/model do exactly the same things for one user and not everyone else. Sure we've seen random reboots, force closing, Wi-Fi, issues which are evident on probably 90% of Droid X phones. The OP however seems to have a much larger issues on 5 phones so far which just makes no statistical sense to me given Motorola's general quality.
I just don't see 5 phones that are purported to be certified refurbished phones all being crap if the user is not inadvertently doing something wrong. Thus my suggestion to keep it stock and work with it that way to see if he/she can test it at each step to see where the problem first occurs.
Sure, I don't doubt there may be a bad run of chips here and there or there are some runs that were made on a particularly bad Friday but for one random user to get all 5 of them from that bad run, that's extremely unlikely.
People don't buy phones to work around the issues of a phone, thats not how they are marketed or sold. We buy phones and expect them to work as they say they are going to work, and when they don't, you deserve a replacement.
My 75 year old parents maybe but, in today's technology age, one can surely peruse the forums of any item out there and discover post after post on how that printer is garbage, that flashlight needs to be held a certain way for it to work right, or this or that phone needing to be lovingly coaxed into working right.
Unfortunately, the days of buying an item and expecting flawless operation are over and every purchase is a crap shoot. You can believe it all you want but the reality is likely something more grim and less satisfying than you or I would like. No purchase is flawless and, given the rapid advances in and relatively early state of the technology of smart phones, we are only in the infancy here and we are all early adopters whether you see it or not. I'd LIKE to expect things to work as you suggest but I've seen more failures than successes in the last 5-10 years.