Carrie is one I have read and enjoyed. At the time that I read it, I wasn't too keen on giving immensely deep thought to the books I liked. I got enough of that "what is the theme and/or symbolism here?" crap from my English teacher. I agreed whole-heartedly with Bill Denbrough when he asked, "why can't a story just be a story?" Said all that to say that none of this is probably going to be very deep.
King seems to be fascinated with the kid that doesn't fit in. In later novels, these characters became less apt to hurt those around them and actually become the heroes (IT). And this was actually not his first skirmish with the idea of a violent teen (Rage), but it can't be denied that he definitely did something different here. As much as I said I wouldn't go into theme and symbolism... Female empowerment and the frightening transformation that puberty brings (especially for women with the blood and pain and whatnot) is personified in the title character. Stephen King himself even cited that he tried to bring the blood related scenes to the forefront when he realized what a strong symbol that was (On Writing). I can appreciate straightforward symbolism at least. ;)
I found this story very tragic. It was almost as though Carrie never had a chance. Her mother was insane, she was awkward socially, she was gaining powers she didn't understand and couldn't control, and none of the other kids liked her at all. Talk about a recipe for disaster. Yet like most of his stories, it went out with a bang. Again, something else I could appreciate.