1. Drivers. The machine arrives for most with working drivers. If a machine arrives with bad drivers, let's hope there is a scathing review. I've never had this issue so I can't write that a new machine has this issue. I HAVE FOUND that as time passes the makers do not update their web sites. For Nvidia I find the drivers to be easy to find (nvidia.com!) which makes you wonder about the reviewers!
2. Battery TIME. The reason for low times is simple. It's like a high powered sports car and low MPG. These machines have high power components so you get 1 or maybe 2 hours on battery. If you want long battery times, get a non-gaming laptop. Those Acer TimelineX models often get 8 or more hours on battery power.
3. Support. You're right. Windows help is a disaster. Makes you wonder why it's still so bad. Dell support at the office is great. But then again we never have calls about Windows. We are programmers so any software or malware issue is handled in house.
4. My kid wanted a gaming machine. My wife wanted a fast machine to run the Sims. Both are gamer laptops with the usual downsides of 1 or 2 hour battery times and hot due to the high end CPU and GPU. One's an Asus, the other is a HP dv7. Both have i7 CPUs and 1GB dedicated RAM GPUs.
Hope this helps,