For mage gear, the best ratios was on Crimson stuff (lv 67 ones). Both me and several guildies had on average 3 nice stats to 2 crap stats, and sometimes even 2-3 nice stats in a row.
Mage stats have 2 desirable ones, 2 undesirable.
Although since... maybe Glorious or Bygone, on average, I get 2 crap: 1 nice stat.
For the lv 80 and 82 ones, I've rarely seen Int/Mdef. The majority of crap stats I pull are Int/Def.
Every time I pull stats, I pull 3. (I only pull when I get 900 shells)
It is rare that I get no good stats. Usually I would get 2-1 or 1-2 good-bad stats. I pull mage gear. (at least that was the way until I played on GF server)
I noticed better pulls when you do 3 at the time, but that might be just placebo effect...