The original assertion from the first reply in this thread was that quality games, regardless of genre, were ones with larger install sizes. That's what I have been responding to. That's absolutely not true and I've provided a large number of counterexamples to that end. There's simply no correlation.
Madden absolutely would not be a better game, for example, if the game was 10 GB and then EA Tiburon added 40 GB of NFL Films footage accessible via some hypothetical digital recreation of the Pro Football Hall of Fame, accessible only after you achieve a certain Legacy score with a player in Connected Franchise mode. This hypothetical version of Madden would still be a 50 GB game, but it'd play no better than last year's version.
To repeat myself from earlier, the thing that changes by adding more content with specific regard to a sports game is atmosphere and presentation. More content adds more player faces, more player-specific animations, more stadiums, more lines of commentary, etc. These things are nice and can make a good game great, but they cannot make a bad game good. A good game must stand up foremost solely on the gameplay itself. With respect to Madden, the offensive line play, WR-DB interaction, defensive play calling AI, defensive run fits, and what not don't magically improve because the game has a bigger disc footprint. Seeing those gameplay mechanics addressed are the things that everyone in the simulation sports community wants, and those things are almost entirely code implementation and refactoring (admittedly with some supporting animation additions will be needed, yes, but that's a difference on a scale of megabytes, not gigabytes).