Skyrim for one. No it isn't perfect, but they packed it to the rafters and put a lot of effort into building that world.
Xenoblade Chronicles mainly cause holy crap the story was an epic of awesome scale, something so many games lack. I mean it's around 60 hours to finish that main story if you really push for it.
BioShock Infinite for me felt like it was really polished like nobody's business with a lot of attention to detail. There's three games I felt went he extra mile in three different ways.







