Esat.... have you actually seen a NEC LCD2690WUXi 26" just to verify its gaming potential and not just going by benchmarks?
Nope. Superior "static" image quality would apply to anything but gaming aspects aren't that clear... partially also because of very little reviews.
Basing to what I've read NEC's input lag should be about same as in my previous display (Lenovo L220x) meaning 2 frame delay. I've never played games seriously (and haven't had much time lately) and didn't find it disturbing in what I tried some FPS games but LG gives feeling of possibly easier aiming.
Response time would be other factor. IIRC X-bit labs measured average response time of ~6,8ms for Lenovo (many "faster" TNs have above 10ms actual average response time) and in that aspect LG definitely doesn't feel any worser, bigger screen/pixel size should show blurring more easily.
This reviewer wasn't exactly impressed by NEC in that aspect:
http://www.behardware.com/articles/648-3/nec-multisync-lcd2690wuxi-the-first-26-inch.html
On the other hand in that NEC RTC can be selected in settings like ProAdviser mentioned in review so those photos might have been taken without it... but according to PRAD in practise it made only little difference...
Stronger (and/or badly adjusted) RTC causes visible artefacts so maybe NEC is simply aiming to minimizing them for retaining best image quality with slower moving image.
So lovable these LCDs, making one feature better can make other worser!
LG and Samsung are both South Korean makers so maybe they don't like boxy designs in there...
Frame itself definitely isn't winning any thinness awards but otherwise design isn't exactly any "piece of soap", more like compromise betweeen angular box design and piece of soap.