Legos are pretty awesome. Unfortunately, I was more of an instant gratification kid who favored video games over actually sitting down and building something with my own two hands, but as far as toys go, I think they're incredible.
Which is why I totally get grown men who are all into Legos. I get why they watch the Lego movies (they're pretty hilarious). I get why they have life-size Lego constructs in their homes. I get why they've spent thousands and thousands of dollars on Lego toys over their lifetime. Sure, there are "cooler" hobbies, but "cool" is relative, I guess.
Here's the thing, though: Legos are primarily geared towards children. And the Lego brand takes that very, very seriously, which is why when they released their social app for children, LegoLife, they went through a heck of a lot of trouble to make sure that kids were protected on it.