Are kennels more of a good thing or bad?

I think kennels arent a good place for animals to be because of the way they are run. the animals that are being taken care of are locked up in cages and treated like they arent important. When you leave your animals in a place like this you would think that for the money you spend and how nice the people are that your pets would be treated soo nicely, but thats only until you leave. I do agree with people that there are good places to leave your pets where they will be treated nicely and with respect, but its hard to belive that all of them are like that when there are all these documentary films out there that prove to us that what you see isnt the truth.