What is the mileage on the transmission? If yu know
Was the old fluid real dirty and smell burned when the service work was performed?
Is the fluid level correct?
The lazy reverse could be hard seals, worn out clutch pack.
The fluid out the dipstick tube is usually an indication of a serious problem if the vent is not plugged up
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.