If you drive it just a few minutes, such as home from the grocery store, the exhaust won't heat up enough to burn off the moisture and you'll get those puddles.
The other day when I returned from the store (about 3 minutes away) I was unloading the trunk and noticed a stream (not just drops) of water coming out the tailpipe. Never saw that before and I've had my Mystique 7 years.
