Major letdown with Powerline 2000 adapter

powerline devices are sensitive to interference and distance.

things that can interere with powerline are: high draw motors, some cell phone chargers, arc fault breakers (in many new homes), surge protectors, gfci outlets, crossing circuits, cheap power supply devices that inject noise in the wiring, etc.

Reading reviews on amazon is great. But it doesn't tell the full story of powerline. A trusted review site like smallnetbuilder, who uses repeateable testing and with methods that are fully outlined, is the best route to go. 

If you look at this testing for the tplink 2000mpbs plug (similar to netgear) its shows actual speed testing. Best result they get with 2 plugs on the same circuit is 400mbps. The speeds drop off to that just slightly more than 100mbps once powerline device aren't on the same circuit. And this is with testing that is optimized for powerline. The arc fault circuits have been removed, no surge protectors, cell phone chargers unplugged, etc.  

Powerline is a good option for some. But it sounds like your situation isn't the case because you do have gigabit speeds. Most don't and so powerline serves them fine.  Maybe a mesh network might be better. Or even checking to see if they ran phone cords in your home using cat5e. Many did in the time period that your home was built as it was cheaper to get cat5e than phone lines at that time. its pretty cheap to convert them over and is night and day better. 

You can claim class action all you want but you'd have to do it for the whole industry for powerline and wireless. Its also likely to get you banned on here as its in the terms of service to not threaten legal action against netgear. This is the community forum where its members of the public trying to help others out. Not netgear.