The Blue Lions route starts off strong, but the post timeskip is easily the weakest route.
The route completely ignores the world and focuses solely on Dimitri who for half the timeskip may as well not even be a unit as you can do nothing with him besides deploy him in battles. TWSITD are never brought up or dealt with.
Plus the whole redemption arc Dimitri goes through feels so half-assed that I believe the writers realize they couldn't write an insane character people would like so they did an 180 switch.