The vast majority of parents I meet complain subtley about having children and how much of a struggle it is, how expensive it is, how they get no sleep, no free time etc.
Then, they usually realise they can't be seen to complain about having children and finish their complaints by saying "But its the best thing I ever did." This part always feels like the least genuine bit and everything before feels like the truth.
Furthermore, one of my best friends has a child and spoke candidly about it, saying "I love him to bits but wish I hadn't have had a kid."
Source: Im a teacher who deals with kids and parents daily.