<i>suggests a very different sort of relationship from Ron/Hermione or Molly/Arthur,</i>
Well, yes, that's sort of what I was trying to say. R/Hr and M/A have been in much longer relationships (although R/Hr aren't romantic until the end of DH, they are still in a very close relationship for years before). H/G are just beginning - there's a totally different dynamic.
When the issue of Ginny leaving Hogwarts first comes up, it's her mother ordering her to leave. She turns to Harry for support and he refuses to give it. That's very different from ordering her. When he tells her to leave the RoR and then to come back, she runs out of there and we know she didn't come back.
I would not take one incident ocurring in extraordinary circumstances in a still developing relationship as indicative of a pattern or "shallowness" or that Harry doesn't respect Ginny.
I couldn't agree more. How childish would it have seemed if Ginny had thrown a prolonged fit about joining the fight in the middle of such a tense time? I think it would be very difficult (and pretty useless) to try to fight against her parents, her oldest brother and her boyfriend. She just didn't press the issue, but took her opportunity when she saw it. I think this will be a learning opportunity for Harry regarding Ginny's abilities and personality. I also can't fault Harry for wanting to protect her. Harry has lost so many people already, not to mention how many times he's NEARLY lost Ron and Hermione. Many of the "haters" whang on and on about how H/G never said "love" and that they didn't have true love, etc., but what they fail to consider is that H/G were just beginning their journey together at the time of DH. I don't think Harry (consciously) truly realized how deep his feelings were for Ginny, but we were shown many times in the text by his words and actions that he really cared for her and was, in fact, falling in love. I don't think the relationship they had at 17/18 (and at such a wierd, stressful time) was exactly the same as the one they have by the time they decide to marry. They're both still maturing and still really getting to know each other, warts and all.
I don't know why JKR didn't give Luna or Ginny a "moment in the sun" like she did for Neville, maybe she thought it would be too cliche or something. *shrugs* I would have definitely loved to see Ginny and Luna get to show their stuff. All I know is that these books weren't "The Love Story of Harry and Ginny," and I never expected them to be. I'm very satisfied with how they turned out, and for my shipper heart, I was so thrilled by how often Harry's feelings for Ginny were expressly shown.