You don't see courtroom dramas being released that often nowadays, and that's probably not a bad thing. By far one of the most narrative-driven, lengthy and sentimental genres in the film industry, I don't think I've ever seen a really good one either. The Rainmaker fits right in with the rest of the bunch.
A young and spirited lawyer is assigned an insurance case. He's really not equipped to battle the legion of lawyers representing the insurance company, but he wants to support the victims and still believes in the juridical system, but he'll be fighting an uphill battle if he wants justice to prevail.
Performances are okay and there are a handful of decent scenes, but the runtime is indefensible, the drama feels forced, and the courtroom scenes are really predictable. You start a film like this pretty much knowing every single story beat that's going to come, which simply isn't that much fun, especially since films like these have little else to offer.