It's one specific error (if you even want to call it that), that being, Eddie in the game as a light heavyweight, not a problem with the game in general. You could fix that with a cheat device, by the way, if you had the inclination. Since he has now been heavyweight champion, I'm sure he will be a heavyweight next time around.
And Rey vs Big Show isn't so bad, Rey doesn't really have all that many lifting moves. For something really hard, try Matt Hardy vs Big Show.