Horizontally opposed engines are inherently less reliable due to the increase in components, an H-4 has two heads and all that entails, an I-4 has one.
CVTs are inherently more fragile than a geared transmission, they simply cannot hold as much torque.
Almost all Subarus sold in the last 3 years have these engines and transmissions and they still hang.
With that sort of handicap it's either a testament to how great Subaru is or how terrible every other automaker is.