hi @Supreme, first you can start by reading
this (comments from @DRAKON and @HulkSmash were fair, too). from your post, my guess is that you're a pure consumer type of user (who expects things to work as advertised, and depends on official tech supports to maintain their products via warranty).
i know those stories you've read sounded scary, but if you've done your part as a consumer within the allowed time windows, you can minimize the risks to get the defective ones. also, although most of us here are not fan boys, most visitors thought we are. so i suggest you just treat our comments as reference, please go else where to get more objective insights about g-series.
1. before you buy: you should start reading buying guides published by third parties. most of these guides stress on one thing: your common usage. please compare your requirements with what a g75 can offer; and find out if there are better options that better suit what you actually want, then you can choose to go for it, or not. g-series laptops have their own strengths, but also their weaknesses. they are not the best breeds of all options out there, but they fit into a category where price and performance is more balanced.
2. if you chose to buy one: find a good retailer. if the retailer is not happy with what you're going to do (see below), don't engage and find another one.
before the return window is over, please do a thorough physical check and system tests with your new purchase, based on your common usage:
a) cpu and gpu temperatures after long hours of gaming;
b) display panel (for dead/stuck pixels);
c) ethernet/wifi/bluetooth connectivity;
c) usb ports;
d) hdmi/minidisplay ports; and
e) everything else that you use your laptop daily.
from what i've learned, when the unit worked well from day one (especially the physical hardware components), it is very likely to be fine for a long time (until you decide to mess with it). if some components are not right from the start, there will be more coming along the way. so make sure you get a working one.
3. after-sale tech support: now, the quality of work from the service centers varies from one to another. the good news is we have the ROG community that can probably offer you more practical assistance (and solve your common system problems) before you have the need to engage service centers. even if you need to send the unit in, don't panic :D; some of the good guys here can lend you a hand if you needed them.
by the way my 8-month-old g55 is good; no problem so far.