TFA made over $2B WW
TLJ made $1.33B WW
TROS made $1.074B WW
Yes, there is a $1B dip between TFA and TROS, which i'm sure is way more than Disney would've wanted. But all 3 movies in total made roughly $4.5B at the box office. Strip away your fanboy hat for just a second and put on an analytical one - this was solid business whether you like the films or not. And none of that is even counting Blu-Ray/VOD sales, Toy Sales, etc. These films practically paid for the entire Lucasfilm acquisition alone. Also, if you want to talk about the brand being strong, all you have to do is look at Rogue One. A spin-off Prequel film with all new characters that all die and it still made $1.056B WW. The success of The Mandalorian also shows the brand is extremely strong. People clearly didn't like the new trilogy on the whole, but they do like things that remind them of classic star wars, like Rogue One and The Mandalorian.
Just imagine if the whole trilogy was cohesive how much they could've made if they are generally disliked and still made $4.5B. Fantastic Beasts could make all 5 films they originally planned on for the franchise and still not make $4.5B WW based on the most recent film only bringing in about $650M. And generally films make less and less as a franchise goes on, especially if the public is disinterested. Does that show the Potter brand is weak? No. It shows Fantastic Beasts is a terrible franchise.