IMO the AI was just far superior in 2K4. CPU QBs in 2K5 are just terrible without completely dumbing down the defense. 2K4 QBs will drop back, take their time and find the open man, dump off to RB or take off and run with it...just doesn't happen in 2K5. QB spy is broken in 2K5, DBs AI is bad and they get badly burned far too often. Also kickoff returns were far better in 2K4.
Graphics and animations seem almost identical to me. There were a few added, the QB throwing animations are nicer looking in 2K5 for sure.
Not saying 2K5 was a bad game, I think their intentions were great...they added a massive amount of extras in that year and just ran out of development time...they needed one more year. ESPN 2K6 would have been far and away the greatest football game ever made, IMO.
