What if the S5 was metal??
Would people still be complaining?
Seriously, over 90% of the time when I see someone with a phone they have it in a plastic case.
The uproar of the S5 is annoying...if it bothers you that much then get the HTC One which will probably end up in a plastic case.
According to AndroidCentral, the S5 screen is now as bright and good as the Note 3 (which has one of the best screens I've ever used), a better camera, and waterproofing, not to mention theyre still one of the few phones to offer a micro sd slot.
If anything it should have had 3GB ram and started at 32GB instead of 16GB, but in every other instance it looks like a solid device.