The downtown Buffalo Hyatt, located across from the Buffalo Niagara Convention Center, recently remodeled many features within the 25-year old hotel. Check out their web page and take a look at their photo slide-show: looks great! They state on the website that they even have Kosher catering available.
In the past there were many negative reviews of the hotel/hotel rooms, and I'm sure it was this reputation that kept it struggling. After the renovation, there has been an increase in the positive reviews. These reviews do not reflect wedding-specific or related matters; only on hotel accommodations, service and decor, etc.
Things to note: parking (and, if you're/your guests are staying overnight, Internet) are not included in the cost of the room.