See, I disliked the way Jackson handled it. I preferred Tolkien's view that there were some people who just didn't have it in them to be corrupted. It just wasn't like the Faramir introduced in the book to be tempted at all. He served as a motivator and example for Frodo, and as a foil for his brother. I didn't ever get the feeling that Gandalf and Galadriel were truly tempted, just more cautious should they be ensnared once they had it. Faramir wasn't the only one not to be tempted in the books. Sam wasn't either--another weak point of the movies in my opinion. The only small hesitation Sam had in the book for not returning the ring was personal concern for Frodo, which didn't seem to be connected to the ring at all. In the first chapter of the first book, Gandalf makes it clear that character counts when dealing with the ring's temptation. Hence Bilbo's resistance vs. Gollum's corruption (hated Bilbo's gollum face in Rivendell, too).
All of things I disliked about the films concern weakening characters, sometimes dramatically. Faramir was weakened for his initial temptation. Frodo was weakened both at Weathertop and at the Ford of Rivendell for not standing up to the wraiths. Sam was weakened in his best scene at Shelob's pass. I understand why Jackson did what he did. He wanted to press the point that Sauron was indominatably evil and the ring was ultimately corrupting, but I think that was already clear. Faramir, Frodo, and Sam are heroes because of their resistance of the ring. I disagree with you completely that this strips the ring of power. It's pretty clear by this point how bad the ring is. It's more about how ideal Faramir is than about the ring at all in my opinion. It's not even about how powerful Faramir is--he isn't. It's more about how much his ideals matter. I think it strips the entire Faramir scene of its point when he's tempted. I would've preferred they leave it out entirely. It was one of my favorite scenes in the book.