Taylor makes really great quality instruments in my experience, and I'm quite partial to their sound. 9 times out of 10, cracking tops are due to users not taking proper care of their acoustic instruments; airconditioned and heated homes with temperatures and humidity flying all over the map will crack a top in no time flat, and that's the guitar owner's fault.
I agree that is often the case. But, in at least the one case I know the guy and he is very careful, not only keeping the guitar cased with a humidifier in the heating months but using one in his studio as well. Taylor gave him some serious hassles asking him to prove that he had done so.