One would hope. In some of the best zoos maybe, but sadly, it's most often not the case. Zoos often have specialties they excel in- likely by virtue of having attracted very dedicated staff- so some departments may be better than others. A modest zoo might excel in herps, thanks to an excellent staff, while a world-renowned zoo might focus elsewhere & just "get by" in the reptile department.
We have to be careful not to make assumptions. I've been "behind the scenes" in the reptile house in a large metropolitan zoo, & another mid-size city zoo, & didn't see anything that actually impressed me- quite the contrary.
When you consider that zoos may only focus on display, not reproduction & preservation of the species or on research, it's easy to see how dedicated "hobbyists" & private breeders can make a huge contribution. Zoos have to make ends meet, so they have to sell tickets & attract donors- this can require different priorities- there's often some "show biz" involved.