Looking past Eren and Historia's character development and Rod's desperation/cowardice, one of the reasons why the titan fight felt so anticlimactic could be because this arc in general isn't even about humans vs titans anymore and that the enemies are now other humans.
It could be that the titan fight was purposely handled this way so as to not distract from the present direction the story wants to/is trying to go in. Basically, the fight was purposely underwhelming to signify the tonal shift of the plot. Either that or I'm just overthinking this.
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"When there is evil in this world that justice cannot defeat, would you taint your hands with evil to defeat evil? Or would you remain steadfast and righteous even if it means surrendering to evil?" - Lelouch vi Britannia as Zero.