This is not good. I took a look at the phone at the store today, trying to make a decision on a new phone shortly. While I love the form factor and the lightness of the G3, I can't say that I was overwhelmed by the build quality of the case. It's certainly possible that, over time, cracks can develop and possibly due to the heat built up inside the phone, which has a lot more work to do with this model. I honestly don't believe anyone is "trolling" here and any such accusation is more "fanboi" behavior than objective analysis.
I'm against the wall. Have a very good deal on a new model or debating about a crazy good deal on a Samsung Note 3, which is slightly larger and has a little better battery life, albeit at a lower resolution. While I can't say I'm a big Sammy fan with their lackluster builds, I do have more confidence in those cases than I did with the G3. It's just so strange that I'd find the G3 build so toyish when they are capable of putting out a phone so well crafted like the Nexus 5. Given the issues of warranty, I may stay away from the G3 on that alone, be it what it may.