Your favorite and least favorite things about Discover University?

I know it's a pack everyone wanted for a long, long while. I still haven't bought it, however, cause I don't know if it's worth it. I'm kind of intrigued by the robots and having roommates.
The only expansion packs that I don't have are Discover University and Cats & Dogs.
Also, someone tell me, what interactions can you have with the robots? Simbots and Plumbots were one of the best things about Sims 3, hands down.