LOL @ this whole thread. The N54 is a beast, but it's just not as reliable as it should be. A lot of great cars aren't reliable, a lot of reliable cars aren't great.
I'll bet dollars to donuts that the N54 has more problems than all other BMW products. Is it the end of the world when a fuel pump or coil pack goes? naw. Is it an inconvenience? Absolutely.
That being said, I love the power and fuel economy. If only the components could keep up with the high bar set by the rest of the engine!