Overall: If you loved your galaxy nexus but felt like if it had just a better radio it would be perfect, then the Motorola X is for you. It looks and feels a lot like an updated and improved galaxy nexus with the addition of being able to customize the look. Is the camera great, no but the galaxy nexus camera wasnt the greatest either but if you can live with that then you will be getting a solid overall device and I do believe that it is worth the asking price.
I know what you mean about the screen. It's nice, but noticeable when you're used to the S4 (or even the One). Something about the colors feel more cartoonish to me as well, vs. the S4. I know both tend to be "oversaturated", but the S4's doesn't feel near as much when compared to the Maxx (or X in your case!).
It's the 4.3 camera setup. It did the black screen thing now and again last week when 10.2 first came out. I haven't noticed any issues lately, but I'm taking fewer pictures now that I'm not on vacation.
First impressions about the Moto X are good for sure, not great though. It does feel nice in the hand but is actually a little small for me, especially being used to the S4. The phone is snappy with no lag what so ever, the active notifications are cool, touchless control also a nice feature.
That being said, the screen is obviously not on par with the S4. I didn't think that would bother me that much but it really does. I like the colors a lot more on the S4 and the clarity is noticeably different, up close mostly.
The camera is not great but that was expected.
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This was taken with HDR off with semi low light in my office. Even though this was is a great phone for $139, I don't think it can replace my S4, especially if they get a method to flash CM 10.2 on the latest update and the camera is better.