Any site that makes it easier to do genealogy work can only be good!
If you are in the fortunate position that your family history lines are 'clear cut', then you probably wouldn't have much use for a site like this, however, I know from first hand experience how difficult it can be if just one piece of your family history is incomplete, it can be a nightmare trying to get the help required to fill in the missing information.
I was reading recently an article in a newspaper, that was basically saying that these days, most people in the UK do not know, or care less, what history lies beyond their own Grandmother, ie-- they haven't even checked out who their own Great Grandparents are!
Years ago, people would sit and listen to what elder family members had to say, and the information was passed on this way. If people are no longer interested in this important information sharing, then sadly the information 'dies' out with the relative!