Take a look at the display section on GSMarena review of G2 I posted above. G2 got 667 nits at max brightness, right on par with One and iPhone5 near the top. Not sure why there is discrepancy with anandtech chart.
In any case, believe me G2 screen should be plenty bright, especially compared to AMOLED screens on most Samsung and Motorola phones. Just because there are even brighter LCD screens doesn't make it poor screen in brightness.