Subaru, and many Subaru fans, claim the issue has been resolved. My independent Subaru mechanic, however, tells me he’s seen head gaskets last anywhere from a few thousand to a few hundred thousand miles, and it doesn’t matter much what year the car is.
The older 2.2 Liter engines don’t seem to have many head gasket problems, and for some reason the 2.0 Turbo engines don’t, either. I don’t know much about the 6-cylinder engines.
There’s no way to predict head gasket failure, or the lack thereof, on a particular car. If you want the sophisticated AWD system of a Subaru you pay your money and you take your chance.