Be careful of what you read on forums. Some info is interesting and very informative. But then you have the nit pickers and trolls who just complain about everything to hear themselves complain.
My first Outback was an 09. I purchased it brand new and had it until this past January, when I took delivery of my 2015 3.6R. In those years the car ran fine. It only had mechanical issues the last 6 months I owned it and where covered under warranty. The first was a wheel bearing, no big deal, and the power steering pump was a fluke.
Other than that, the car was superb. I have no regrets buying my 2015 3.6R and even though I got a little paranoid over the windshield, I'm going to remain calm with my new windshield, until something bad happens. The crack I had was from a rock hit, so I can't say it was a badly designed windshield.
I'm not saying it couldn't be, just like the wind noise debate, I'm sure there was a real problem there to have so many complained. But Subaru must have listened and fixed the problem before I got mine because I haven't suffered from horrible wind noise.
As for allot of the other complaints about the entertainment system, Sat Nav, poor tire quality, ect... To me, most complaints are at best conjecture, and open to personal opinion, not fact. It just comes down to either operator error, lack of operator knowledge, or a knee jerk reaction to something not working properly and not giving the dealer a chance to fix it properly.
I can guarantee you this. There are vastly, more 2015 Outback owners who love their cars and have had no problems whatsoever, than what you see in a forum like this. What these forums are, are microcosms of a few Outback owners, especially 2015 Outback owners, that either join a forum like this to help with a legitimate problem, curious about what's going on in the Outback world, or just want to complain. I've even seen some new members posting on here about their "2015Outback" that you can tell have no idea what they're talking about, and I have my doubts they even own an Outback, let alone a Subaru.
When you look at negative posts, make sure you look at the OPs join date. If they just joined and are doing nothing but complaining, there you go. If they sound like they're having a problem and are concerned about what to do, then you also know.
Be level headed in what you read, and enjoy your new awesome Outback!