Being DRM-Free is not enough, you may be right on that. But you're quite wrong on many other things.
a) Overpriced? Prices for most games are the same as other stores, for example if you buy Pillars of Eternity Hero Edition for 39.99e on Steam, it's the same on GOG. With one exception: GOG gives you store credit due to regional pricing, at their expenses nonetheless.
b) GOG's installers are better than other stores, why you may ask? They include fixes and improvements that come right out of the box, other stores (such as Steam) throw the game as it is and it's up to you if something is broken. You're new so probably aren't aware of such things.
c) Witcher 3's pre-orders (both digital and retail) were missing the Executable and it was only obtainable on release day, I would hardly call that DRM since you can play without internet or the need for any clients, you can't say the same for other high budget games, which force Steam/UPlay/Origin.
d) Most AAA games aren't on GOG because their developers/publishers are afraid of letting go off DRM and games with DRM aren't sold here, Take it up with them not GOG.
With that said, GOG is not perfect, no other store is for the matter, but it does many things right where others fail to. It's not crap, but different. If you think it's not worth your money you're free to buy from elsewhere.