2007 (?) 17" MBP - bad display (no recall), bad battery (recall)
1-gen MacBook Air - broken hinges (Apple used unsuitable metal in first shipments, replacement program), CPU throttling leading to long pauses (Intel issue? disabling one core 'fixed' it if I remember correctly, but there was no solution by Apple even though they tried), audio disconnecting (warranty-covered fix)
White MacBook - plastic case cracking in hands area (not sure if there was a replacement program)
2009 White Unibody MacBook — rubber bottom case ungluing (replacement program, although I was late to it, so didn't replace)
Mid-2014 MacBook Pro Retina — screen anti-reflective coating ungluing (just replaced a week ago)
Oh, and Apple cords. They are like printer cartridges. I bet most Apple users apply PVC tape to them (Apple claims their cords are PVC-free... sure, when sold).