This is the playpen we had as well.
No, I don't think they are. I think they can be incredibly useful. In my last place, our TV was on a shelf that LO could easily reach and in our living room we had a huge sliding door that had blinds and she would rip them down. So we had a playpen. If she was in it playing, I was in there with her. It's not like I left her there and walked away. Obviously it was great when I had to use the restroom or something because I knew she was safe. I see nothing wrong with playpens, they keep a child safe.
We are in a new place now and my TV is on a mantel over the fireplace. Now everything is baby proofed and we no longer have blinds.
The only thing I don't like is they're not the prettiest.