UFC 6 has improved in a lot of areas, but the overall presentation still feels pretty basic compared to other EA Sports games.
More cinematic camera angles, better crowd and corner reactions, live statistics, and more broadcast-style presentation would make fights feel much bigger, especially for main events and title fights.
The replay system definitely needs work too. Seeing the same few camera angles over and over gets repetitive very quickly. It would be great to have proper full-fight replays after a match, better slow-motion highlights, and more variety between rounds.
Gameplay is obviously the most important part, but presentation goes a long way toward making the game feel like an actual UFC broadcast instead of just moving from one fight to the next.