Cortian is right, but let me clarify my opinion. Wifi can work in ideal scenarios, good quality WiFi for instance, ruckus or Cisco aironet or equivalent. But rarely WiFi is ideal. With the number of factors and variables that can occur it can be more problem than it’s worth.
Even with the best WiFi, you have to remember that WiFi is a two way conversation.
This is where the first issue comes, in my opinion after using many WiFi enabled cameras, the WiFi part is weak and substandard with small gain antennas.
Second devices such as these require at least a -65dbm signal level to be able to operate properly. Rarely is this achieved across an entire site and in every corner of every room. So signal may not be strong enough in the optimum position for field of view.
Interference can make and break your installation.
You have to run power anyway so why not just run a cat5 and use Poe.
Likely hood is your not going to be watching the cctv all the time, so do you want to risk a blip in communication that misses something important that can be caused by something as simple as someone walking in your hotel with their hotspot enabled on the same WiFi channel.