It's difficult to translate what you're saying. You say "go to visit" which implies you don't see your friends with kids very often. If true you're in a poor position to make these judgements even by your own standards.
Everything you're observing is even more likely to occur if you don't see them that often. Your friends probably want to spend more time focusing on you. The kids are not that familiar with you and are less likely to engage with you. Which also makes the parents more likely to want to distract them with something else.
Whether or not you're bringing children with you matters too. It sounds like you don't because you're focusing on child-adult interactions. If someone has kids the kids run around and be kids with their loudness, and child-adult interactions are going to be much more likely. If you're not bringing kids in tow my kids are much more likely to just go off and do their own thing.
Much of what you're pointing out can also be down to individual child temperment. Which changes as children age. By your standards many parents turn into a bad parent once their kids become a teenager.
That is not to say that your observations are 100% wrong. But just that there's so many variables, most of which I didn't even mention here, makes trying to analyze your statement make my head spin.
Not to lean too much on anecdotes, but I have a friend who has extremely well behaved kids. He has said a couple times that he feels like he has placed too many adult responsibilities on his kids. Is he a good parent? Based upon outside observation, he seems good. But he seems to be questioning some of his own choices. Maybe that alone makes him a good parent? I don't know, who am I to judge?