Sliding wasn't the problem for some of us in previous 2k games. the real problem was poor defense animations and foot planting. if your light on the the stick and play defense on different angles, and the players has good awareness and lateral movement those combined you will be ok.
If you play real life basketball, what are the rules for defense...
Stay on your toes in a defensive stance
Move laterally, never cross your feet..it will put you out of position
Limit reaching for the ball..you will have better reaction
Stand between the ball and the person your guarding..leave spacing
Sorry if it sounds like I'm trying to teach how to play this game but nothing is wrong with sliding it's apart of basketball.