Personally, there is NO WAY I would cruise the Caribbean on a
DCL classic especially the Wonder and especially after having cruised the Dream and Fantasy. You are not comparing an apple to an apple.
The only way I am going back on the Wonder is for an itinerary like Alaska, Hawaii or the Panama Canal.
The Dream and Fantasy are FAR SUPERIOR IMO (and I have cruised the Wonder). There are way more things available on the newer ships...mini golf, Bippity Boppity Boutique, the new Sweets shop coming to the Dream!, the water play area on Fantasy & the new water play area coming to the Dream, Satellite falls (currently on the Fantasy/coming to the Dream this fall). It doesn't appear that the kids club on the Wonder has the cool new features of the Dream/Fantasy like the interactive dance floor or the cool computer game where you could steer the ship.
My kids said that the Vibe on the Wonder would be a dud after going to Vibe on the new ships. I must agree!!! We went during open house times. And it is like comparing Golden Corral to Ruth's Chris!!
We also had MUCH BETTER SERVICE on the newer ships...apparently we are in the minority on this. But both times on the Wonder our service was not nearly as good as it was on the newer ships...once it was borderline of poor in the MDR. We have always had AMAZING service on the newer ships! To each his or her own, but I would feel like it was step backwards. I would only do it if it was for a westcoast itinerary.