It sucks because it isn't there to enhance the user experience. Anecdotally I never once thought that performing a desktop search should return me Amazon search result (why just Amazon? Why not internet search results if anything? - which is kind of what happens when you perform search on Jelly Bean). It feels cheap, and clutters a visible portion of your desktop UI with ads. I haven't seen anybody like it or praise this because it's so transparently only about revenue, user experience be damned. Your argument for using it amounts to essentially charity (i.e. use it to support your OS). At least with Unity, I can hate it but respect that they were trying to build something new. This was only about revenue. Worse, Canonical, comically tried to argue that it isn't. Nobody bought it.

I actually want Canonical to be successful. I want them to be profitable and I wish they could find a way to make money without resorting to stupid gimmicks like this.

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I buy things on Amazon twice a year (if that). I have a feeling I'm closer to the average PC user than not.