Having been a Subaru Tech ( still call myself a mechanic ) for many years and leaving there in 2015. We Remember the Failures and Bad things, Not all those who had no problems. So here are my observations ..... first 2 years of each FB engine had it's issues. From the 2.5L 2011/12 Forester leaks, oil consumption, noisey chains ( TSB for that ) and failing to fill the gas tanks. The 2012/13 2.0L Impreza, 2013 XV/Crosstrek added valve springs but quieted the noisy chains and fewer front engine oil leaks. fewer here came in for oil consumption, but the issue was still there. Finally the 2.5L 2013 Legacy/Outback, mostly here for Oil consumption. I would have liked to report it was solved by now, but my experiences it was not completely.
Now I left in 2015, so the 2014/2015 years may have been too new to show any chronic issues, But these are my observations. And owning a 2014 Impreza now with 150K and a 2016 Forester with 100K, we have not seen the issues of the earlier productions.
My $.02 ......