Yes, my kids have a TV in their room. And yes, they spend all weekend playing video games.
This is what they say if you ask them. Reality is a little different, however.
Yes, they have a TV in their room -- an old, tiny 1980s portable TV that sits dusty in the corner, unplugged, only to be used when one of them gets sick and can't leave their room and has to lie in misery all day waiting to get better. That's when we bring in the vcr/dvd/playstation, to give them something to do to pass the time. Otherwise, the set is useless. But it's there, and they'll tell you it is if you ask them.
My younger girl struggled to learn to read and had trouble writing, and I bet a substitute could easily have come in and thought that it was our fault for letting her play all those video games she kept talking about, rather than understanding that she had issues she was born with (and luckily grew out of). It had nothing to do with screen time. I worked with her intensively; she just couldn't grasp them until she was older. But once she did, she flew. She's now reading at a fifth grade-level, despite those pesky games. She's written and illustrated her own complex stories. Not too shabby for an eight-year-old.
But you know what? She still claims to love video games more than anything, and that's all she will mention if somebody asks her about her weekend.
My kids do not get ANY screen time during the week. At ALL. So they save it all up for the weekend. During the week, they read, draw, play with any number of puzzles, legos, tinker toys, lincoln logs, a doll house, stuffed animals, etc. They also do this on the weekend, but since they do these things all the time, they don't even think about mentioning them. That would be like them telling you that they had breakfast, lunch, dinner, snacks, a bath or two, a few cups of water, and went to the bathroom several times. It doesn't register.
Oh, and they read and draw like you wouldn't believe. My older girl can draw dozens of pictures in one sitting, and goes through reams of paper. Our kitchen table often looks like an art store exploded. My younger girl goes through books at an unbelievable rate. But they won't remember to mention these, because they are also things they do all the time.
What they remember is that they finally got to play that game they've been waiting all week to play. They don't get to play until after lunch, and then they take turns, on the video games and the computer, with a timer. It's all interactive, rather than mindless TV-watching (we don't even have cable). We even try to sneak in some exercise by requiring them to play DDR. They don't get to play all day, though they always seem to remember it that way.
I've gone to school on parents' night and read my younger's journal, where it says stuff exactly like what you're saying here. And guess what? You'd be wrong about us.
Not to say that that universally applies. I'm sure there are parents who have kids who do watch TV and play video games all the time. But please don't judge the parents on what a kid might say. It's really not your place to judge the parents at all. Especially without knowing all the facts.
When I think about how much time I spent glued to a TV or playing video games as a kid, I shudder. Yet I was at the top of my class all through school (and athletic). Go figure. Still, I do believe limiting screen time is a good thing. My autistic child can't handle too much of it when it's passive, and the DS made her plain crazy and we had to take it away permanently.
But not everyone's problems are the fault of a screen, and you can't possibly know for sure that what a kid's telling you is reality. We are practically the anti-screen family, but we would still have gotten labeled as the opposite if you took my daughter's word for it: she also never fails to mention that she watched TV all weekend if we go to a relative's house and they have the TV on for a little while; since we don't have cable, TV is a BIG deal.
So maybe think about your source of info before you decide that somebody's parents are doing something horrible to their children by letting them play video games. And even if they are letting them have too much screen time, I can think of a lot worse things parents could do to their children.