Here's another reason why we always tip, no matter what:
Once while in port last year, our ship was fairly empty. We had gotten back early from an excursion and my son (then 6) was at the foosball table on the pool deck, just flipping the handles around, bored at the thought of having to play his mother again. One of the MDR servers (not ours, by the way) who was working on the pool deck clearing tables that day approached and challenged him to a game. They ended up playing two games, and OF COURSE my son won each time. I hardly need to tell you my son is the worst foosball player around.
So here's a crew member who made my son's day a little more magical, and did it for no other reason that out of genuine kindness and regard for a guest. There was no angle for a tip, as he wasn't even our server. It's little things like this that might go unnoticed that are the reasons we cruise Disney, and are the reasons why guests should always tip even if they don't feel they should because of [insert reason here]. Unless you get abysmal service, and it is not corrected after you talk to the Head Server, really, there is no reason not to tip the recommended amount, if not more.
By the way, I did write a fabulous letter of recognition for this crew member and left it at guest services. Felipe from Portugal, what a great guy.