You heard well. They are not super high quality lens, but they are better than kit lens of Canon.
If you are planning to buy wide angle lens one day it's better to buy 28-75mm, since it's good for everyday use, for portraits, landscapes, outdoor.
If you are not planning to buy wide angle lens in the near future, 17-50mm might be better. With 28-75mm you might start to miss wider angle while trying to shoot interior or large groups.