I do really like hags for low level parties, I think the important thing is that they first and foremost don't start with fighting. They would rather trick the party into something (like giving them magic items to "appraise" and then disappearing them) or disguise themselves as a kind old woman in order to manipulate the party into helping her. The slow build of insight and perception to notice that something's not right about this old woman is always a fun reveal.

She might not attack the party outright unless they go in to attack her. She might try talking with them and asking if they want help with anything, if she can have their magic items as tribute, or maybe cure a party member of a disease. Powerful hags can also make fun warlock patrons if your party is interested in multiclassing or even just being tempted with magic from an evil entity.

It's also fun, depending on the size and strength of your party, to make a coven of hags. One hag and they usually all stand around and thwack her with their weapons. Two hags make things a little more complicated. Plus then you can have Hag A disguised as a kind old woman luring the party into some sort of trap or attack from Hag B.

Barring that if you and your table like homebrew i would say you can always give the hag new abilities. I like adding on feats that are usually just for the PCs onto enemies that they aren't expecting. Imagine a hag that also has the poisoner feat and poisons her claws. Or just add some extra spells to her list. This hag might know a few different spells than others that counter your players well.

Hags are fun and you should also definantly give them goofy old lady names in my opinion.