My wife was more excited about visiting Graceland than I was but I must admit it was very interesting and enjoyable, despite the staff. While we were there I saw two staff members smile the rest went through the motions of their jobs but it was painfully clear they would rather be somewhere else. They offered on additional info beyond the required and while not openly rude or discourteous they were far from helpful. We ignored the lack of enthusiasm and enjoyed the park anyway.
The place is quite expensive, $70 each to see everything + $10 parking. We chose to just view mansion and grounds and were satisfied. We enjoyed ourselves and were impressed with Elvis's achievements and his mansion. Worth the trip.