No.
You will always read about problems with updates because few people will post to say 'hey I just downloaded a new release and its working fine. How many reports of problems have you read, a few dozen? how many people do you think upgraded? Probably tens of thousands at a minimum, maybe hundreds of thousands.
Plus of course, as per the person with the email problem who posted here, then later said 'oh no its wasnt that I fixed it, it was just a coincidence I had upgraded to 10.5.8', now people are posting here 'I got the email problem' as if its an acknowledged fact!