I may as well throw in my 2 yen here...
I took Japanese I and II (taking place sophomore and junior years of high school). My teacher was a native Japanese woman from Kamakura who came to the US and has been living here for about 17 years now, I believe. I doubt having a native teacher has helped any more with the language than a non-native teacher. She was really good though, or I was just really studious (the latter probably being more likely). Anyhow, there were some people that did pathetically in the class, and others that flew through it like it was nothing. I don't believe it matters about the teacher, just how much you yourself are willing to put into it. If you really want to learn the language, you will.
At my school we started out with hiragana and sentence structure. We threw a few kanji in, but only after we knew hiragana backwards and forwards and inside out. Katakana came next; probably the second semester of Japanese I. My teacher didn't stress any one part of Japanese; we had to be able to do it all. Speak it, read it, and write it. I absolutely loved it! By the end of Japanese II we had about 100 kanji under our belts, we could speak basic Japanese well (the ones who put effort into learning, that is), we knew the proper greetings, we could read quite a bit, we could write properly. It was well rounded, and if I decide to continue my learning in college I think I'll be set up just fine.
So just stay focused, don't get discouraged, and don't lose sight of your goal. Try to be as well rounded as you can in your studies and I think you'll get the most out of it. Good luck there, Hiroshi