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I finally solved it! For those who are also new to ROS, this is what I did:

First, install openni2. I believe you need Hydro or Groovy for that. As jbinney mentioned, openni2_camera works with USB 3.0. In particular I used openni2_launch: roslaunch openni2_launch openni2.launch

In order to see the images you need to use image_view but with different topics than it appears in the documentation. For example, to see the RGB images, I use rosrun image_view image_view image:=/camera/rgb/image_raw, instead of rosrun image_view image_view image:=/camera/rgb/image_color as in the openni_launch wiki.

Thanks! :)