As a psychologist, I'm often called upon to nod and frown, whilst someone pays me lots of money so they can recline on a leather couch. Sometimes, I even get to do some psychology, which mainly consists of mentioning the word schizophrenia, tutting and frowning, like the world's axis rests on the gravitas of my words. Then I get paid lots! It's great.
So, in the case of the movies, I diagnose... schizophrenia! Or rather, multiple personality disorder (that costs double). The Movies wanted to be both a great management sim and a great movie-making program, and found that it couldn't live up to both. It wasn't bad by any means - a solid Ron Howard standard of game, rather than the hoped-for Terry Gilliam. It was just that the management side was difficult to navigate and control, while the movie-making side proved hard to get good results; you could make much better machinima with an FPS, a few friends and Microsoft movie-maker. Look upon Stunts & Effects as electro-shock therapy then. It looks spectacular, it sounds cool, and it might just heal those niggling weaknesses. Or it could drive the movies deep into mediocre madness.
Stuns & Effects does exactly what the Ronseal feller says. Starting in 1960 it adds a new class of actor, the Stuntman, as well as a selection of supporting buildings and sets, and updates some existing sets. The effect of the Effects bit is to improve how these sets look, by adding in fire, explosions and so forth. We're not going to touch on the effects bit again, so we'll just say it makes the movies look ever so slightly nicer. There are some extra-cool sets included as well, from green and blue screen stages, which allow you to replicate just about any scene, to a miniature city set.