I was on the same cruise as BurtonRiderT6 and agree with his assessment. While we had a good time cruising with 2 other couples, I was disappointed in the quality of food, service and entertainment on the Epic (with the exception of the Blue Man Group).
Have cruised on the Dawn twice and the Star once and the Epic did not compare favorably for me. The ship was massive in size with way too many passengers to be serviced properly by the amount of staff on board. Service was exceptionally slow in the dining rooms. The one exception was Moderno in which we had the best meal and service of the cruise.
The elevators were jammed during meal hours and the pool deck was overflowing with passengers during our sea days.
Was also unhappy with the layout of the ship that forced one to traverse the casino in order to get to your destination. I am sensitive to smoke and while the filters did a fairly good job, it wasn't enough to stave off allergy attacks. Will stick to smaller ships in the future.