i think they're bad, the backgrounds as they are designed are too weighted to being advantageous to certain classes, and not always the intuitive ones (having seen criminal wizard mentioned in other threads iirc), this kind of boxing in of options was decried in species yet they've just managed to remake it in backgrounds.
personally i'd want backgrounds designed more as where you pick from a list of thematically apropriate options, for example:
Sailor
-increase your stats by +2/+1 or +1/+1/+1, and gain one origin feat.
-pick 2 proficiencies from the following: athletics, acrobatics, nature, perception and performance,
pick three of the following:
-gain proficiency with water vehicles, one of either gaming set or musical instrument and one of either cartographers tools, navigators tools or a language.
-gain a climb and swim speed equal to half your walk speed.
-gain two additional skill proficiencies from the sailor's skill list.
-you are considered proficient in any skill when it's use is directly in association to being a sailor.
-you learn the cantrips Gust and Shape Water.
-you gain proficiency with the Spear, Trident, Scimitar, Net and Light and Hand Crossbow.
-you gain the tavern brawler origin feat.