Backgrounds have been one of my absolutely favourite elements of 5e since they were introduced -- a rich way to individuate characters from level 1.
Plus: I like the layout, and the ideas, and the one-page convenience that also communicates substance; there are a real thing for each character. The alternatives, and the basic equipment list are also flavourful
Plus: I also like the way that the mechanics have been made completely consistent:
2 skills
2 tools and/or languages
1 unique ability that ties you to the world, the "feature" (though you don't get this if you customize, which actually is an acceptable limitation).
It makes it really easy to invent new ones, without throwing the system off.
Minus: I do feel they've puled back though from how important backgrounds are for characters. In the end, background is responsible for half a character's skills (typically) (2 of 4). I really liked the importance that they represented when it was 3/4 of a character's skills typically. But I recognize this view might not have been shared by 175,000 others.
So -- overall very good, but I do feel they veered away at the last minute from being excellent.