This got me interested in going back and looking at the data. I don't have throughput data, but I do have statuses and wait times. The data I have is not 100% accurate because I'm relying on what their system feeds, but it does provide a good overview for how things are going.
Out of the 17 attractions that VRTP update statuses for, since February between 10AM and 5PM, Leviathan is the 6th most unreliable attraction across property. I got this by comparing the rate at which the ride reported itself as being down and closed versus open.
A big problem seems to be that it often opens late. Here's a breakdown of the likelihood that it'll be open for each 15 minute interval after opening:
By around 11:30 things seem to become pretty stable, but 27% chance of it being open by 10:16 is pretty low. I do agree that Leviathan does the job for Sea World, but it definitely still seems to have some teething issues.
Here's some bonus stats for those interested. This is the status breakdown of the main coasters between 11 AM and 4PM February across property:
Since February it seems that Village coasters have spent an hour down for every two hours operating. Here is also the average wait by month. Leviathan is easily one of Village's most popular attractions.