We took our then 2y/o son there in May? June? last year (when foot and mouth was running riot). If you can tell me what you're worried about specifically, I might be able to help? But a couple of points to be going on with:
On the minus side, it was a bit old-fashioned and shabby, decor-wise. But then again I think if it had been any posher you'd be worried about your children spilling stuff etc.
They had loads of animals but they were off limits because of the f/m so I can't tell you whether the children would otherwise have been allowed to stroke them, play with them etc.
Personally, I would go back again when they're older as I think it was more geared up for older kids. They had a fantastic obstacle/endurance course and loads of space to run around in.
The swimming pool was excellent but not open often enough/long enough.
The food was good and at least you didn't feel like you had to apologise for your child's behaviour!! Say no more.
The babylistening service was useful. Meant you could go to the bar, play badminton, whatever in the evening without worrying about checking up on your child every five minutes.
There's not a lot to do in the immediate vicinity so you've got to have a car. Our son was/is mad on trains and there was plenty to do on that score.
That's all I can think of for now but like i said, if you can tell me what's put you off i might be able to help you a bit more.