Here’s the pitch: a young man, reeling from the death of his father, drives across country with the brother he never knew who, as it happens, is autistic. Cast one of Hollywood’s most respected actors as the autistic brother and its hottest leading man as the younger brother, and even today the pitch sounds like something straight out of high-concept hell. Yet despite its premise, which jazzed up the bankable but disreputable formula of the road movie with a mental-illness twist, Rain Man was not only the most popular movie of 1988 but also one of the most acclaimed Hollywood releases of the year, winning both the Oscar for Best Picture and the Golden Bear at the Berlin Film Festival, the only film ever to win both of these prestigious awards.

Today, Rain Man is largely remembered for its awards, for Hoffman’s performance, and the memorable lines he contributed to popular culture, including such favorites as “I’m an excellent driver.” But like many surprise hits, Rain Man was initially seen as a somewhat risky project by Hollywood. Several directors and a number of studios passed on the film before Barry Levinson and United Artists ended up making it. And while the film was in production, both of its stars had doubts about its potential. The film’s opening weekend receipts were disappointing, but soon it began to generate ecstatic word of mouth among moviegoers, eventually raking in over $170 million domestically to become the highest-grossing movie of the year.

So what was the secret to Rain Man’s success? Well, the stars didn’t hurt. By and large, major Hollywood projects were more star-driven in the eighties than they are nowadays, and Rain Man followed the popular Hollywood formula of pairing a respected veteran actor with a hot young star. And in 1988, there was no young star hotter than Tom Cruise. Still riding high from the success of Top Gun, Cruise had earlier in the year turned the cheesy bartending drama Cocktail into a sizable hit. Yet even in his younger days, he had a tendency to seek out established talent. He had followed Top Gun with The Color of Money, which paired him off with Paul Newman under the direction of Martin Scorsese, and Rain Man gave him a similar opportunity to work with Hoffman.

But while Hoffman was the one who got most of the accolades, I think that the film hinges just as much on Cruise’s performance. Don’t get me wrong- Hoffman’s certainly impressive. But due to the nature of Raymond Babbitt’s autism, Hoffman doesn’t have much of a character arc to play- he doesn’t change so much as cycle, again and again, through his daily routine. Levinson and screenwriters Ron Bass and Barry Morrow wisely avoided the temptation to soft-pedal Raymond’s autism by miraculously having him “recover”, and they’re to be commended for this. However, a movie solely about Raymond would have quickly become repetitive (think Jeanne Dielman, which actually sounds awesome so never mind), and certainly would not have been made by a Hollywood studio.

Because of this, it falls to Charlie (Cruise) to drive the story, and Cruise was more than up to the task. Charlie is a complicated character who’s often selfish and unsympathetic. Consider how greedy he can be, especially when it comes to Raymond- he steals Raymond from an institution in an attempt to procure more money from his late father’s estate, and once he discovers Raymond’s prodigious memory and gift for quickly counting large numbers of objects, Charlie decides to take Raymond to Las Vegas to score money by cheating a casino. But Cruise’s refusal to make Charlie a saint makes him all the more relatable. Sure, he can be a self-centered prick, but we also feel his pain whenever we see him dealing with Raymond. After all, keeping one’s life together (especially when the bank is breathing down your neck) is difficult enough without having to plan one’s days around someone like Raymond, for whom the need to eat one’s meals on time, watch The People’s Court, or wear the correct pair of underwear supersedes all else.

Because we see Charlie struggling with Raymond, it becomes all the more heartwarming when he finally learns to love and appreciate his older brother. In many ways, Rain Man may contain Cruise’s most undervalued performance, since not only is he upstaged by Hoffman’s showier work, but he also plays the sort of role that was often associated with him, the yuppie hotshot with an overabundance of alpha-male charm. However, to call Charlie Babbitt a stereotypical “Tom Cruise role” seems reductive, since it overlooks the nuances of the character. Then as now, Cruise was a fine actor, and one who was often doomed to being underappreciated.

Rain Man isn’t a perfect movie. Occasionally, it gets a little too plot-driven, as when Charlie and Raymond make their stop in Vegas. But at its best, it’s as good now as it ever was, due to the performances of Hoffman and Cruise and the rhythm and chemistry between them. Cruise might have joked that it was “two schmucks in a car,” but I think that’s what works about the movie- it gives these two fine actors sufficient time and space to work together without pinning them down to too much plot. And while Raymond doesn’t get better in the end, at least now he has a brother to visit him in the institution.

For better or worse, in the two decades since its release Rain Man has become the dominant pop culture image most people associate with autism. A few years ago, the Onion A.V. Club critic Noel Murray- himself the father of an autistic child- posted his thoughts on the film, filtered through his own experience. In this post (which you can read in full here), he states that although the film gets many of the details of autism right, it suffers because Raymond feels less like a character than a plot device through which Charlie can find redemption, and that the subject of autism would be better served by a movie that followed him and found drama in his routines. It’s a perfectly reasonable opinion of the film considering his circumstances, and I don’t disagree with him. As a movie about autism, Rain Man doesn’t quite cut it. But taken on its own terms, I’d say it still works pretty darn well.