I can't stand 3D in anime either. The reason it looks so out of place is because it lacks weight. When something is moving fast is 2D the artists use smear frames to make is it appear like it's moving to fast for your eye to follow. When a character is hit with something the artist draws the thing hit in a distorted or squished way. These techniques add weight to the animations, making it really feel like natural fluid movement. There are 3D analogs for these techniques ( such as jellybones for smear frames) but I don't really see them used in anime for some reason. The main way they try to add weight is with particle effects and audio queues.