I really liked MVP except for the fact that the graphics were cartoonish, I have no clue why they went in that direction, you can just look at 2k7's graphics this year and understand how great it can feel to play a game simply on how emersive the graphics can be. Also the player rankings were kind of odd, just bars filled up to a certain point, made it hard to get an idea of what a player was rated, who was rated more highly than another guy, and if the players rating made any improvement over the season. Then of course the no personality of bad commentary and very lacking in the presentation deparment.
Other than that, the trading was more realistic, the gameplay was less buggy and smoother, as well as minor leagues and better CPU Franchise AI.
I wish they could slap some 2k prenstation and graphics on an MVP game, and start rating players from 1-100, and I'd have my dream game.