Done right, EQ can improve almost any track. It’s easy to get caught up in the science and numbers of the objective data, but is that all really necessary? Because so much of music quality and enjoyment is subjective, you should always trust your instincts. If something just doesn’t sound right, change it. If everything sounds great, but the EQ doesn’t look like anything you’ve done before, let it be!
You can read more here: http://therecordingrevolution.com/2013/02/18/the-non-technical-approach-to-eq/