First off, trust me, as Gothbogg said you'll be fine, whatever complaints you have about the film, I will probably have 5 times that amount (of course I'm only assuming). But, point is, I don't get beat up too bad lol. Anyway on to the question.
Yes, I do feel they should have added Halbarad and Elrond's sons. Elrond's sons are the best orc fighters of this age, and would were key additions to Gondor's victory. As you already said with the Dunedain, it would add more of an explanation to Aragorn's "kingship."
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