This is an interesting thread, because after a visit to Chester (my one and only), I was one of those who remarked in one of my photos that, in my opinion, the lion and tiger enclosures were disappointing.
I'm no expert on any sort of animal enclosure by any stretch of the imagination, and my therefore my reaction to them is often on a gut instinct basis ...... i.e. they seem to be small (for the size of animal, and/or for the number of animals it contains), or it contains little or no enrichment, or outside shelter. Other enclosures may seem to be inappropriately sited, so that ignorant visitors can easily torment an animal who has nowhere to hide.
I have to say that one of the benefits I've found of finding a truly interesting and informative forum like this is, on occasion, being reassured in a discussion that such and such enclosure, despite 1st impressions, is suitable and adequate, because the animal concerned would naturally live in similar surroundings and wouldn't actually require the stimulation that us (less well informed) humans might imagine they might.
Going back to Chester (and I've been analysing why I made that remark) my initial impression of both the lion and tiger enclosures were that they seemed comparartively small (for such large animals), very flat, and lacking in platforms and scratching posts. However, I also suspect that my feelings were probably influenced by the fact that I had visited the smaller big cats 1st ........ obviously, the jaguar area is very impressive and well landscaped, and the cheetah area also seemed sizeable. Moving on to the largest big cats, I couldn't help compare the respective enclosures and feel a bit bemused at the contradiction in size, given you (well, me) instinctively feel that larger animals should have most space.