Did I miss something?

I just recently discovered the text boards and /lang/ has quickly become my favorite. I see a lot of things that say Amerifags can't pronounce anything right. Have I missed something or are there Americans that can pass off as natives? I myself am taking German and though I don't know a whole lot of German, my Berlin-native teacher has commented several times that my pronounciation is either on par or very close to a native German's. Am I special or is it just poking at retard Americans?

OP here again. I re-recorded them, and I suppose after having heard and said them I looked at how I said them the first time, and re-worked it. I said the first one slower and it sounds much better personally.
Also, I don't know how you're supposed to say Sylvia in German. Zylfia? Sounds too bizarre.

Anyway:
Sylvia wagt quick den Jux bei Pforzheim
- http://www.mediafire.com/?mzbuanmymz0
Franz jagt im komplett verwahrlosten Taxi quer durch Bayern
- http://www.mediafire.com/?gnhekwywjf0
Victor jagt zwölf Boxkämpfer quer über den großen Sylter Deich
- http://www.mediafire.com/?baqagnjziuh
Falsches Üben von Xylophonmusik quält jeden größeren Zwerg
- http://www.mediafire.com/?myowy3ko2n0

Looking on them, I'm probably out of practice considering no one I talk to regularly can speak any German, so most of the practice I get is actually during the year when there are students about.