We did not go there until my youngest was 8. We enjoy it, but I can't imagine a toddler would enjoy it and may even be overwhelmed by it all.
Pirates is awesome, but you are on a "boat", 3d glasses with thunder, lightening, pirates and their ships coming by.....you are shooting cannons trying to sink ships and naturally cheering and yelling as your "boat" rocks. I don't think a young one is going to find that fun.
There are a few things they may like, but not enough to make it worth the trip if you ask me. Personally, I would save it for a future trip ! That's what we did.