I mean, yes, it was disappointing. But as I reflect back we had an amazing experience with some once in a lifetime sights. The Pursuit got MUCH luckier on landings, but I don't believe they had a pod of 10-20 orcas swim directly beneath the bow of the ship. Every Antarctica experience will be different but they're all amazing in their own way. It is Antarctica, after all.
Venture and Pursuit are the newest and best luxury expedition ships you'll find anywhere. Some itineraries I believe spend more time in Antarctica, so if you want to maximize your experience you might look for one of those.
The final thing is that as more and more ships go to Antarctica they are sharing the same number of potential landing sites. That gives far less flexibility if things go awry and the expedition team has to scramble for alternate sites. And that's true for every cruise line. Like highplanes says, it's a roulette wheel.