The answer, like a lot of things, is it depends. There is a two-fanged problem. First fang is that you want your house air tight for energy efficiency purposes. Second fang is you need fresh air for the health of the occupants and the health of the building, so the house shouldn't be too tight. Fresh air is a good thing. Hence the need for trickle vents that slugworth mentioned.
One potential problem is that air can, and often does, enter the house through spaces like the crawlspace, basement, or attic, in which case the air is stale. So the wiki is correct, an ERV can improve air quality because you are drawing in fresh air from the outside as well as conserving some of the energy.
Since you are building your house, I would aim to make it as well-insulated and energy efficient as possible and install the ERV. On older homes that are presumably leakier it becomes kind of a crap shoot.