Good idea, horrible execution.
While Hill of swords in paper reads like an awesome idea it suffers from a terrible execution, a flawed one if you will, when Louise summons Shirou he is not the Shirou we all know and love, he is a sociopath, despite Gabriel blessing trying to give Shirou an Archer like feeling he fails at doing so, Archer is pragmatic, cynical and sarcastic, GB!Shirou thinks that it will be a shame to kill all of the people in the Academy in order to make sure his master is safe.
Beyond that Shirou has not really matured, he is still reckless and represents the idea of Leeroy Jenkins, he went in the end arc to fight an entire kingdom by himself, despite UBW having enough weapons to match an army Shirou is in the end human.
His portrayal of the cast is bland at best, i dont feel depth on Louise, Siesta, Henrietta or any one else they are there to say how good or great Shirou is or Louise to be overtly Tsundere.
There is a point where Shirou breaks down because he thinks he has become archer after he sees himself on a mirror, somehow he and the original FSN cast miss a giant spot check with his 'Archer-like' behavior.
While a good concept as i said before it crashes down before it can even fly.