I used to feel this exact way, and I do still think there are more than a few of their services that are pretty paltry.
But with Prime video, not only do they have highly praised original content, they fill in gaps that Netflix and Hulu have, with content from the HBO catalog, as well as TV shows that Netflix doesn't carry.
Add to that, the shipping for me, while not perfect, any time I've done free same day shipping, it's there.
My only request would be that I would gladly trade some of my benefits (Amazon music for example, along with others) in exchange for some type of access to audible.com content.
It would be nice if you could configure these services a la carte, but I doubt that's in Amazon's financial interest.