Oh! I thought it was simply terrific. Almost completely pitch perfect. I mean, even though I died probably 500+ times (I may be underestimating, there were 2 sections of the game that it literally took me multiple nights of play to get past) I never thought it was unfair, just that I suck. I also think the actual gameplay complemented the tone damn near perfectly.
I also thought the ending was predictable, but I mean that in an extremely satisfying way. Like, this is the only way that would even make sense for it to end.
Altogether a great piece of storytelling and gaming. I hesitate to call it particularly "fun" the way I'd hesitate to call playing something I suck at for hours on end, like say golf, "fun". But it's certainly a triumph of a game that I will probably never pick up again simply due to the frustration level it inspired as I twisted my fingers into pretzels trying to complete it. (If I'm going to do something I KNOW I suck at for stretches that long, I'll stick to golf so at least I get outside for a bit.)
I can certainly see why it is being called one of the best games of the year, and I certainly wouldn't strenuously disagree. I wouldn't say it was MY favorite game of the year for reasons already mentioned. :-D