Oh dear... as Cat-Man is young, a serious prep-talk about sensibility by one of the members should be given by another member first. If it continues, then I agree with taun as it was a seriously innappropiate without realisation that some members may have been affected far more seriously than others as a result of the event.
Now, steering away from such subjects, I'll say that I like a good balance between fuctional and natural where possible (though I prove an acception in the Aspinall Parks, as expensive immersion just wouldn't work there). Sorry if I sound biast, but Marwell is a good example of this, with plenty of fuctional enclosures for the animal's benefit yet with several impressive exhibits like Roof of the World, Life in the Trees and the African Valley.
I also love basic enclosures that are natural without spending £££. The lynx and soon-to-open wolf enclosures at the New Forest Wildlife Park as great examples, just fenced in conifer woodland that are large, stimulating, private and natural homes for the animals.