I do not find the setting of Burgers' Safari to be dull, even though I would admit that a bit of landscaping and some enhancement of the visitor experience would make a significant improvement. Walking out of the forest to find open paddocks at the rhino viewpoint is, in my eyes, a great experience, even if does not give a "real" savannah feeling. The big cat paddocks are indeed some of the most basic enclosures Burgers' has to offer. But I would argue that there's a strength in their simplicity. Does it matter that it is a just "a bit of forest with a fence around it", if it looks like this:
I would chose that over a mockrock enclosure any day! However, I do think the Safari suffers a little from the comparison with the other ecodisplays. The Rimba is only one that is in some way comparable (outdoors and focused on larger mammals), and that one is significantly younger, and build when the zoo's concept was much further crystallized.