I know the parent comment will be downvoted, but I'll reply anyway. I'd like to hear how this "sucks". One could argue they may track you, invasion of privacy or that it's "just the beginning" and will lead to more adware. Those are what I'd call minor complaints. You can say you think it looks bad, or that it slows down your system, or that you'd would never use it. Those are even more minor as you can uninstall it in less words than your comment.
But think about this. Nearly everyone shops on Amazon. This is the easiest way to give money to support this OS. People all say "I'd pay for it" but that never works. Instead... going to buy something on Amazon? Use Unity, and support your OS. Dead simple, and you don't have to touch your wallet.
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.
It sucks because it stinks of authoritarianism and selfishness. How do users benefit? How does the community benefit? Why are you trying to justify that users should be glad that they're being spied on and spammed?
How does the amazon shopping lens spy on users? The search string gets sent to Canonical, they search amazon using that string and return results with their Amazon affiliate link.
Find another business model, this one sucks.