We have eaten at 50's every trip, we will make a point of going back in April. I wouldn't dream of missing it. We have always had a good server who was "into it". But, of course, you always take a chance with servers. We always heard people rave about WCC, but when we went, our server was not very fun. He called himself "Crazy Chad", but he barely smiled. We watched with envy at the other servers, who were really silly and made a fun dining experience for patrons. Poor Crazy Chad..maybe he was having a bad day. He was nice, but we did expect more, based on what we had read prior to our trip. But it's the chance you take. It wasn't a bad experience, it just wasn't special.
The food at 50's is good, not great. But I love the atmosphere so much, that even if we get a server who doesn't care about being in character, it will still be my favorite restaurant at WDW.