It's actually a good area design-wise, but for fuck sake, the whole Europa area in Metal Gear Solid IV. The way it was wasted with the worst stealth-escort mission ever conceived, with an over-the-top scripted as fuck on-rails chase sequence and ends with the weakest boss of the whole game has retroactively not make me want to replay the game. I have a blast with the first two chapters then stop playing altogether, because it's just boring. It was boring the first time around, it's even worse when you go overpowered and it still manages to be aggravating as hell.
I loved the design and it's actually a very big map with tons of shorcuts and places to see. But alas, you're not supposed to explore it.