Huh? What are you talking about? How are some broad facts going to spoil your game? All right, maybe telling exactly how many major areas are there could be a spoiler, as after a while you could suspect you were reaching the endgame (in the unlikely event that you couldn't tell because of plot gimmicks). But otherwise, telling that there may be about X relevant NPCs (not necessarily joinable), over Y word written dialogues, and around Z sidequests gives a much better idea of the scope of the game and its complexity without actually giving anything away. It's such an effective teaser method, in fact, that you can see comments of that sort printed on the back of the boxes of many games. Don't you read those either, for fear of being spoiled? What do you rely on to make a decision then?