Ryan doesn't seem like he's really skilled at action games, but that's probably true for most of the people picking up DI. I think the problem isn't that this sort of trial is in the game, but that it's mandatory to progress. It should have been an optional challenge room, not a barrier in the way of a less skilled gamer.
People bitched to hell about GOW's turning spikes, when personally I found that section easy. For the type of player that enjoys these games, you shouldn't be making such demands on their skill, especially at the end of the game.
A walkthrough of the tougher segments of a game are usually in a review guide. They tend to tell you exactly what you need to do to get past the harder bits, but don't cover the full game.