Good AC guitar tracks, for me is no trivial thing.
I too am not enamored with recording acoustic guitar tracks...and while I can get a decent sound miking...on many occasions, when it's just a "filler" rhythm tracks, I will opt for using one of my Dean Markley Pro Mag acoustic picks.
When miking...I've never had a fret buzz problem...it's usually more about the right tone for the track. I've often gone with a condenser, up above the soundhole, about 10-12" away, at a 45 degree angle down at the hole...and it's not right over the hole, but maybe a couple of inches toward to head.
Usually I will set up the mic, put on my headphones, grab the guitar and then just play while I move a little this way and that way, until I hear a good tone in my headphones...and I make not of the position I am in. Then run a test recording, and listen to the playback, and adjust as needed.
My biggest problem is I'm not an acoustic guitar kind of guy...I play mostly electric. So I don't have the best technique or the finesse need for really great acoustic playing. I mean...I can strum my way through easy enough...but the real intricate playing and finger picking...not my thing.
That said...yeah, if you have fret buzz throughout...it's either just bad hand technique or you don't have a good enough grip yet...or the strings are way to low, or both.