It's not good or bad, it's just a preference. Most automatic shifter will wear out eventually though, they just aren't meant for manual use all the time.
Don's a racer an thinks D is for dipsticks! He always shifts it manually for performance! For the street,,car knows best 95% of time! But sometimes we need to show our manly ways an A J Foyt it! May want to list your problems the best way you can an you'll get completer, faster answers! Got couple of tranny Guru's here an they will set you straight! Good Luck an I hope you got er fixed!