Molly was miffed that Percy was sorted in Ravenclaw. But in her opinion, it could have been worse. The boy could have ended up in Slytherin, what would make things worse. Ron and Ginny were also not happy, why couldn’t Percy go into Gryffindor like the rest of the family and not break their mother's heart, but they were glad that he wasn’t a slimy snake. Their lives would have been worse with a snake in their house.