While I agree that Boba Fett is a bit overrated, there are some things that Boba Fett does that make him more interesting and competent.
First, he's a bounty hunter. This adds an element of mystery and gives us something that's not the Empire and not the Resistance. Kind of like Hans and DJ actually. He actually pulls off some clever stuff, like hiding in the debris field and being able to track Hans. He has a flamethrower and jetpack, which makes him stand out, much in the way that simply having a light saber makes a character stand out more.
Plus, there's a bunch of out of movies lore stuff associated with him. A decent amount of his fandom got built up outside of the films, and of course, the prequels with him being a clone of Jango Fett and so on.
Granted it's not a whole lot, it's still more than when compared to Phasma, who literally just seems to exist to get beaten up.