I have to agree with Adrian ... part of the fun of this game is being exposed to lesser-known players, running over to one of the online baseball reference sites, and learning more about them. Steinfeldt as the missing link in the Tinker-to-Evers-to-Chance infield (if his name fit the rhyme scheme, would he be in the Hall of Fame too?), guys like Larry Doyle and Al Smith who were damn good in their day, the old Senators like Judge and Rice, the Lonny Freys and Bucky Walterses. I think it's great that modern baseball fans get a chance to rediscover these guys. That's my favorite part of ATG--it's also a history lesson.
It's also why I don't get too excited by Mattingly, Toby Harrah, Sandberg etc., in the new set. You can already play them in the 80s. I would've liked a lot more old-timers.