In the book, he leads the Hobbits off the trail from Weathertop, but then he gets lost.
Maybe he doesn't come out where he originally wanted on the way from Weathertop. But after one quick scouting trip, he's back on course.
After Boromir's death, the angst isn't about Boromir, it's about Aragorn. Everything I do comes to nothing...
That sounds to me more like what anyone would say when they've had a bad day. :)
But the first time I read the book (I only read it once, then saw the movie) Aragorn wasn't one of my favorites. Now he is, and I appreciate the movie Aragorn for all the same reasons JenB does and I appreciate the book Aragorn. Of the two, the book Aragorn has more shades of gray. The movie Aragorn does not. But again, Jackson doesn't have the time to give Aragorn all the shades that Tolkien gave him.
What makes Aragorn a good king in the books is all the shades of gray. His 80 years learning how to be king makes him a great king.