ARC is simply a cable saver. It enables you to use the same HDMI connection from the AVR to the TV to feed audio from the TV instead of installing a separate optical or coax cable. The functionality of the ARC connection is no better or worse than what you would get from an optical or coax connection.
Most TVs only pass stereo from external HDMI devices such as disc players, set top boxes, and game consoles. Some TVs will pass DD 5.1 from those connections. But, none do DTS. ARC is really only useful if you use an off air antenna for TV reception and for sources that are acquired by the TV, such as Netflix streaming. But, with streaming, you are limited to stereo unless the source offers DD 5.1. Most do not.
If you need to attach a device to the TV in order to get 3D, then run a separate optical or coax connection from the device to the AVR for audio.