LG drives are generally considered to be less good overall than drives from Sony/Optiarc, Lite-On, Samsung, and even Pioneer before they switched chipsets.
Now, that is just a general impression. It doesn't take into account specific models that may be better than the LG norm.
LG drives for the most part do not having scanning capabilities, nor are they the best or fastest readers. About the only area that an LG might shine in is as a burner, and once again, that depends on the model and the firmware version.