Lucia is also my favorite route, and I think it was quite well written. I especially loved the mystery that was happening in the first half. Pretty exciting, and the hints sometimes steer you away from realizing who Asahi Haruka really was. I guess, as pointed out earlier, that is totally Ryukishi's writing style at work haha. Love it or hate it; I guess I'm pretty neutral towards it.
And then the date. OH DEAR LORD THE DATE. It gave me diabeetus. I loved every second of it. That, everyone, is the right way to make a tsundere. One that will go dere once she is aware of her feelings. All the other crappy tsunderes remain bitchy even after becoming self-aware of their emotions.
And finally, the final part. Really intense psychological abuse on Lucia, the way they got her to do those things after all that has happened. But I loved the final battle scene. All throughout, my mind was screaming "JUST SAY YOU LOVE HER GODDAMNIT KOTAROU!!!!" and when he did the tears started pouring out. Man I remember that scene quite vividly as my room was dark (sun was just about to finish setting), I was wrapped in a towel (because I was sick back then) and wiping my tears away with said towel.So yeah, while it was quite obvious what needed to happen, I think that heavy buildup before it happening was what made it have a greater emotional impact on me.
Ending is really sweet too~ Gives them a chance to live a new life. Kind of reminds me of the Akane ending as well