The G751 Asus ROG that I am on right now requires an alternative fan control program in order to have some semblance of playing games reliably without a complete system thermal shutdown, and you still have some screen resets (black screen midgame going back to active gameplay, while the system continued to otherwise operate) among other issues. If you try to let the stock fan control software conduct it's thing, it will cook the shit out of the system like it's trying to deep fry onion rings with a side of Intel.
They are relatively notorious for having shoddy internal construction (Bent cooling fins on radiating elements from the factory, poor application and types of thermal compounds) as well as some of the most useless bloatware on the market. The hardware itself also has some stupid features that are basically useless to boot. I have this fantastic Steam button that serves no purpose other than to start and kick Steam into "Big Screen" mode on the computer (which is dumb as a box of rocks imho) and another couple buttons like that... that you cannot reconfigure easily to do anything else, and/or disable them completely so if you DO happen to tag it hunting for ESC, you're not all of a sudden kicked out of whatever you were doing. So, even if you're playing a non-steam game, all of a sudden you hunt for ESC or try to grab a macro key and now you're stuck bounced out of your game waiting for steam to load and go fullscreen before you can even exit out of it.
Honestly, I'm looking at MSI for the next big laptop(s) for the family and offloading this as soon as possible. Pretty much, this system has proven to be the last straw with regards to Asus "Anything" with the family. The only good Asus anything we've had were our Asus Transformer tablets.