The timing for counter-punches was tightened. This rewarded players with high ring IQ who could read their opponent's patterns.
If you're looking to dive back into the ring, I can help you with: The best for realism
Developers increased the stamina cost for missed power shots. This ended the era of "button mashing" and forced a more tactical approach. Key Technical Fixes fight night champion 1.02 patch
The patch improved the reliability of the jab, making it a viable tool for setting up combinations rather than just a throwaway move.
Desync issues that caused matches to end prematurely were significantly reduced. The timing for counter-punches was tightened
Many fans prefer the 1.02/1.03 era mechanics over modern combat games.
The primary goal of the 1.02 update was to address the "spamming" issues that plagued the early online leaderboards. Players found that certain exploits took away from the strategic "Sweet Science" the developers intended. This ended the era of "button mashing" and
Even years after its release, Fight Night Champion maintains a massive cult following on Xbox (via Backwards Compatibility) and PlayStation.