Generations is said to be good although I don't have it myself. I do know that you can go to prom though. I really want it but i have to get the regular Sims 3 to work on my computer.....Apparently I need Shader Model 2 Happy Simming!!
Medieval is not very good. Personally i didn't like sims 3 as much as sims 2. The reason for this is the lack of items in the original game and the need to buy the expansion packs to get a good amount of objects to use. Whereas in sims 2 from the get go there was a wide variety of items to choose from.