I've got a 2013 Focus ST with 39k miles on it. It's a great car, but it hasn't been as reliable as I'd like. Over the Thanksgiving holiday, with 37k miles, it was in the shop to have the head gasket replaced. I baby this engine until it's warm, driving gingerly until the coolant is hot and staying out of boost until the engine oil is hot, so I was extremely disappointed to see engine problems.
The dealer said that neither the head nor the block were warped, but the notes on the paperwork they gave me said "Removed Cylinder head. 2 bolts at front of head took very little effort to remove. Center bolt on intake side was extremely tight." I take that to mean that the bolts were not torqued correctly at the factory, resulting in the gasket failure.
In all it's been back to the dealership several times, all under warranty:
-Rear motor mount replaced (A TSB was issued with a revised part)
-Radio antenna replaced (They told me that the antenna part was apparently bad AND it had not been correctly installed, resulting in horrible AM reception)
-Recall done to replace wiring loom
-Head gasket replaced
Long story short, I'm thinking about getting a WRX.