I like the Owner Mode as well. It's just fun to me to get on and play with family and friends in an environment where we can draft our own players, construct our own teams and overall have no excuses for losing because it's the team you put together.
When I'm playing by myself, I enjoy the Player Mode. I don't really go beyond QB, RB, LB, Safety because I see the other positions as pointless, but when I'm bored it's always fun to start a new player and build his stats up