Your points on Nurse are not unwarranted--she is averaging an amazing shooting percentage right now and playing excellent basketball for the #1 team in the nation. But your standard for Ionescu is a little absurd. Yes her team has been beaten twice--by teams currently ranked #3 and #5 in the nation (both games were, btw, on the road, and I don't think anyone would say Oregon has more talent than either team). Unlike Kia Nurse, I bet opposing teams plan their defenses to stop Ionescu. You can't do that at UConn--every position is a threat. If I was an opposing coach playing against UConn, I'd tell my players to never let Nurse get an open 3 (more than 50% of her makes from the year are from 3), but I'd honestly be more concerned about defending KLS, Dangerfield, and Azura.
And FWIW, UConn and Oregon have had one common opponent thus far: Oklahoma. Both had excellent games with very different expectations:
Nurse: 17 pts, 6-10 FG, 2 rebounds, 1 assist
Ionecu: 38 pts, 10-20 FG, 7 rebounds, 6 assists