This isn't just about a horse. It's about chemisty, and how an odd assortment of misfits can accomplish whatever they want as long as they have each other.
It's something that should appeal to all of us misfits here, anyway. Think of it as a D&D adventuring party. Everyone's got backstory, everyone's got a weakness, everyone's got their special skill, everyone's got their need. Individually, they're just screwed up losers...but together they can kill the orcs and dragons and have whatever they desire.
I haven't read the book, but I am going to now. It's a great story...it's entertwined with the industrial boom of the turn of the century, the expansion out west, the boom of the 20's and the crash and depression of the 30's. It's success in the face of adversity...and it's a true story, too -- it happened.
The acting is superb. Jeff Bridges (channelling Tucker a bit) is wonderful as Charles Howard, at once confident and optimistic and as broken as everyone else. Tobey Macguire will win an Oscar someday, the only question is when and for what role. He puts so much into every character he inhabits, and makes each one so believable, that this time you'll even believe he's a natural redhead. Chris Cooper...is like, Tobey Maguire Senior. And William H. Macy has a small, but brilliant part.
And the horse is wonderful, too...