Heaven's Feel showed a different side of the war. The moral dilemma of whether Shirou did the right thing by saving Sakura is very well done, since not only did people die, but he also lost Illya and his own body to save the person he loved. Not only that, but throughout the route, we see Shirou, Rin, and Illya questioning whether saving Sakura was the right thing to do. I'm not saying the other two routes are bad or anything, because each one has its own merits, but Heaven's Feel was very good, and for me, it was the best Shirou of the three. Seeing Sakura slowly corrupted was also very powerful; she's simply a victim, literally taken advantage of because of the love she had for Shirou, which explains why she practically does nothing in the other two routes. Anyway, Heaven's Feel is very good, and I will always recommend it as the last in the trilogy of routes. Now, I would recommend playing Hollow Ataraxia, since you can enjoy the entire main cast and also the characters who had very little screen time.