That was the point. It was about the destructive nature of Makoto, and how his actions were destroying himself and those around him without himself realizing it until closer to the end, when it was too late. It having the very dry and empty feeling throughout most the show was very effective, but also its problem, and I can see a lot of people dropping it for that.
Semi-amusingly, if Makoto had broken up with Kotonoha early on and gotten with Sekai once they realized they actually made a good couple, all the shit could've been avoided. But then, of course, no show.