They rarely let me down. They are extremely competent and very well made, they are imaginative, often huge in scope, offer tons of value and most of all are just plain fun, be it single player or co-op!
Lego Lord of the Rings and Clone Wars are my two favorites. Not a big fan of the Batman franchise.
The only ones I have played have been the Star Wars and Pirates ones. I do confirm. It was fun when you got all the stud multipliers. You'd walk into one stud and all of a sudden, "True Jedi/Pirate" appeared on the screen.
Science is interesting, and if you don't agree, you can f*** off.