65uA in STOP3 is certainly over the specification's maximum of 6, unless you're measuring your whole circuit's current draw, not just the MCU's.
Regardless, whether this is good or not depends on your design's average consumption, the battery's mAh rating, and the minimum acceptable battery charge/replacement intervals for your design. We've found (with a different chip) that if we follow the (manufacturer's) recommendation to tie all unused pins (assuming there are any) to either ground or Vdd (as inputs, of course) that we get very close to the specifications. Also, shut down all but the necessary internal/external peripherals before entering STOP (e.g., A/D module, if not expected to exit STOP via A/D interrupt).
Hope this helps.