I went to Marineland ~10 years ago and it was one of the saddest things I've ever seen. Very poor wildlife management and obviously exploited orcas. I've heard it has gotten worse since then.
Can confirm. I was there around the same time (2007), and it was sad. My wife (who grew up seeing commercials to Marineland) had always wanted to go, because it looked so fun. Was literally the worst part of the trip. She was so disappointed.