I've bought every version of Madden and never completed one season yet, on any version!
I'm really close on Madden 12 for the Wii, though. I'm ten games in, playing coach mode.
For me it all just boils down to the length of time it takes to complete a game. I'm 39 years old. I don't have the time nor patience to play a game for an hour + anymore these days. Hence why I stick with the ol' 8-bit Tecmo SB. Three games in one hour, is more gratifying than one game an hour.