I didn't find the character stereotypically gay at all. I agree that the reviewer is being hypersensitive. I do think there is some serious homoerotic tension between Wade and Prince, but I liken it to the homoerotic tension I feel, in a way, between Jack and Sawyer on "Lost." They're both indeed straight, but the intensity of their emotion toward each other (in their case, it's an intense hatred rather than devotion) is super-charged and makes someone like me REALLY want to see them make out.
I think the homoeroticism in 3:10 was intentional, but I didn't think Mangold/Foster were making the Prince character seem stereotypically gay. Like Katherine, maybe I'm out of it, but I didn't see anything the least little bit limp-wristed about him. In fact, he kind of scared the crap outta me, and no overtly gay character has ever done that before. I do think his sexuality is meant to be ambiguous, though. And I think the sense I got watching him and Wade interact that Wade knows this and plays on it in his own favor (i.e., plays Prince a little to get that dogged devotion out of him) was intended.
I also think this is a love story. An unconventional one, and one about platonic, filial love and not sexual love. I think Wade and Evans come to love one another - they come to respect the decency and morality they each find in the other and come to realize they're really very much alike, and that if one event in either's lives had gone the other way, they would be exactly like the other. It's really lovely to watch their respect and ultimately love for each other grow over the course of the film. Without giving too much away, I think Ben does what he does in the end more out of love for Dan than because it is his nature (but both are true).