Most mass marketed cruise lines are going to this option. I always feel that one reason is that a lot of people stay out of the dining room to avoid tipping the staff there. If you have a choice tip on your own and accordingly. All ships have a gratuity guide that gives you a suggested amount. If the service is lower than anticpated, be sure you tell the purser's desk about it. I have never had a problem on Princess and I am sure you won't either.