If I can go to the Reader, to Time Out Chicago, to Yelp and Zagat and Metromix, and to this forum, not just for basic information but for useful, independent comment from people who don't have a vested interest in the success or failure of the restaurant being reviewed,
why do I need your website?? Simply listing the daily specials isn't enough -- if the restaurant has its own site, I can get that from them. The coupons just turn me off (coupons cheapened Marshall Field's, remember? Which is part of how it came to sell itself first to Dayton-Hudson, which became Target Corp., then to Macy's). I wouldn't want to eat at any restaurant that sent me a coupon, unless I'd already eaten there and liked the food anyway ... in which case, it'd be the food and not the coupon that brought me there. So no coupons.
Besides, another poster was right: it's not just getting the info right in the first place, it's maintaining it over time -- and you can't count on the restaurants to do that for you. It just won't work. Wearing my journalist hat for the moment, I can tell you from having worked with newsletters and magazines for a few decades that the comparison to newsletters is apt in this respect:
1) you don't start a newsletter unless you can either give people valuable information that they can't get anywhere else in the way you're giving it to them, or else you do it better than anyone else does it;
2) you don't start a newsletter and get people depending on it, then fall down on the job and only publish or update it intermittently -- you have to be regular, be timely, and be consistent, or your readers will get pissed at you and stop reading or relying on you, and you'll be worse off than if you hadn't started the newsletter in the first place; and
3) your reputation rests on timeliness and accuracy, and you can't delegate that to anyone else. If you start this website, you are, in effect, the chief editor, and the buck stops with you. Period. Either own it, or don't do it.
Sorry for the tough love, but you did ask. And either you do this for the benefit of the users, offering something they really need, or you don't bother with it at all.
-- webdiva