I think the vast majority of the times you want scout, most any non-terminal is just as good. And pearl diver usually better. Because when you want scout, it's usually for scrying pool (okay, the re-order helps you a bit here, but mostly it's another non-terminal), vineyards, fairgrounds, HoP, or... well, that's about it, no?
You can make a mean draw engine out of apothecary/scout/wishing well. But you can make a pretty mean draw engine out of apothecary/wishing will. And the scout version, what are you doing with all those cards? Maybe hoard? But even here, it doesn't do a lot for you.
So I think now that scout is the worst card in the game, relative to its cost for sure, maybe even if it cost $2. Eh, maybe not then. Even so, you want it sometimes, but... well, sorta.