I was very familiar with the length and everything else about the game before I bought it... and I'm not disappointed (shouldn't this be obvious for anyone hardcore enough to buy both versions?) Metal Gear is my favorite franchise and I always do everything there is to do in every installment...
The novelty of motion control has kind of worn off for me at this point. Though the Minority Report style stuff on that Move looked kind of cool. Meh, I may end up getting it down the road. But if I do it'll probably be for Ape Escape 4.