First, let me ask where else can you go and for $10 be able to come up as close as three feet to a full grown tiger with only a chain link fence between the tiger and his dinner (you)? No where that I know of.
This is not a zoo. It is similar to big cats in the wild. The staff is friendly and offers the history of the cats you are seeing on the tour which takes about an hour.
It could be hot in the summer with all the vegetation and trees around.
A really great experience and well worth the drive and the $10 entrance fee.