Here is my opinion. Reviews when it comes to dealerships are usually rated in 2 different categories. Service vs. Sales.
So which is it rated poorly in? Next point, how big of a dealership is it?? Do they have the most allotment of cars which will get the car u want to the dealership quicker or as quick as all the others or is it a small dealership who it may take an extra month because of a lower priority? Lastly, if the sales reviews are bad, I would probably take them, but at the same time be cautious as hell about all the paperwork and the inspections before you drive off the lot. May be more hassle with the cheaper dealership but I'd rather take that then throw away roughly 450 dollars