Pros: Fun for kids, but not much else
Cons: Pieces get lost easily
I remember when I first got Mouse Trap for Christmas when I was 5. The box made the game look like it was interesting, with all the pulleys and gears and such. When I first opened the box, I didn't even bother actually playing the game; I was just interested in putting all the pieces together and watching the chain reaction take place:
A crank turns a rubber-band-energized wheel that propels a foot that kicks the bucket. The bucket has a small metal ball that rolls down a rickety slope and a chute before hitting a switch. That switch pushes up on a lever, and a larger ball spills off the lever into a bath tub with a hole in it. The ball falls through the hole and lands on the upper end of a seesaw. The little plastic man on the other end of the seesaw is flipped up and he lands in a barrel. The impact of the plastic man shakes the mechanism that holds the cage aloft, and the cage falls down to trap the poor little mouse there.
Like I said, the game is fun at first, but then gets really boring. The only exciting part is watching the mouse get captured, but even that gets old fast. In fact, I can't remember actually playing this game at all.
Another disadvantage is that because the pieces are so small, they tend to get lost very easily. And, with this game, as lost piece means you can forget about seeing that chain reaction ever again.