The only thing I don't like about pugs is how fragile their eyes are. My brother has pug puppy named Frank whose eye was popped out by a single bite from my sister's dog (a german wirehaired pointer). It was awful.
Pugs are by far the most "human" of any dog I've ever seen. They're unbelievably expressive and sensitive. It seems like they can get easily depressed if not enough attention is paid to them. My brother got Frank when he was just entering high school. Unfortunately for the pug, my brother got different priorities while in high school, and Frankie is at the very bottom of the list. Before I moved away, I paid as much attention to Frank as I could - taking him for walks, petting him, playing with him - and my brother would occasionally pitch in, too. When I moved away to Florida, Frankie was a happy, healthy, playful pug.
Half a year later, I moved back home, and Frankie was like a different dog. Overweight, unwilling to play anything. I quickly discovered that my brother - who Frankie is still, for some reason, unceasingly devoted to - is out with friends almost every single night. And when he IS home, he's in his room playing that horrible computer game, World of Warcraft. And there's Frankie, laying on my brother's bed, his one eye watching my brother, and he looks so sad. And when pugs are sad...you can really tell. Like I said, I've never seen a more expressive dog.
So, that's my pug story. I'm not sure if I would ever get a pug of my own because they don't seem to be very healthy dogs (their eyes, their breathing). But they have incredible character and are extremely likeable.