The Nun is one of the highest-grossing horror movies of all time. The Nun earned over 365 million dollars in ticket sales, which boosted The Conjuring Universe to be one of the world's most financially successful horror franchises. That said, the original movie wasn't well received. In fact, it's got one of the lowest ratings in the franchise.
Source:https://www.cbr.com/the-nun-ii-great-addition-conjuring-universe/