I think some are told to comment on the paint color. Just a hunch.It makes me crazy on the house hunter shows when the buyers focus on the paint color. Who the heck cares about the paint color? Paint is the easiest and cheapest thing in the world to change. The always moan about the color of say a kids hot pink bedroom. It's a one day $25 project to change a bedroom's paint color! Worst case scenario, 2 days and $50 if it needs to be primed.
They should be looking at location, lot (ie, don't buy if it backs up to the railroad tracks), square footage, floorplan etc. The person above got it right - worry about the things that can't be changed or fixed down the road first. Don't pass on a great location and a great house because you don't like the paint color!