Again, some of the key points missed?
Scout works well when it collides with a few other action cards as well. Most obviously Vault/Secret Chamber/Tactitian/Crossroads, but less obviously Baron/Explorer/Tournament. I have heard the comment made on other boards discussing Scout that replacing the fourth tournament with a scout may be good play. The interactions with Baron and Explorer may be more hypothetical, and less useful in practice, mind, though I'd honestly say buying one, and just not playing it if they don't collide may not be a bad idea.
On the other hand, to say Scout actually makes your deck worse is a huge call. At the worst, your better cards miss the next reshuffle because you used it with less than 3 cards in your deck and they are all gold. Could easily say the same thing about Cartographer/Council Room, and no one says you have to play the Scout each time. It gives less green cards in your next hand. There are usually better things you could be doing, but this doesn't make your deck worse, does it?