Have flown the 320 series for 6 years and 4000 hours and always found the A/THR does a great job in all types of weather.
Airbus recomends using the A/THR in turbulence and the ground speed mini is excellent (takes a while to get your head round it if you've never come accross it before)
Some of the posts regarding A/THR on the A320 on this thread I can't see coming from genuine airbus pilots!