To the OP, I get no lag in games, either you installed some bad apps or maybe some infected pirated apps.
My sister an iPhone user with no tech background, she just switched to the G2 and likes it.
The flicker issue was fixed in an update. Every phone company has issues with their devices. Apple had some updates where battery life sucked for example and it took them a while to update. You cant blame LG for your TWRP brick (I used it and had no problem), thats a risk you knowingly took, it applies to Apple or any other OEM as well.
Just because you had problems installing a custom ROM doesn't make LG or any other OEM bad, they intend you to use their device as is. You screw with it, its your fault.
Honestly I can understand your frustration but its also partly your fault, I certainly hope you enjoy whichever new device you get.
(Stock ZVC Rom)
Past Devices: HTC Butterfly, HTC One X - Tegra 3, LG Nitro HD, LG G2x, Samsung Vibrant, Samsung Galaxy 3, Nokia 5800, Motorola Razr Maxx, Palm Treo 650