I've eaten at Hayden Block a couple of times and have sampled most of the menu.
I think their strongest main is the brisket - I loved it. The pulled pork and smoked chicken tasted like they needed some sauce. Anywhere else this would not be a big deal, but Hayden Block has some singularly bad sauces. There's the original (tastes of cumin), the espresso (tastes of cold coffee), and the spicy (not a bbq sauce so much as a hot sauce).
The sides were mostly great. Loved the loaded sweet potato and the bacon wrapped corn.
The weakest main was unfortunately the most expensive one: the short rib. It was oversalted and dried out.
I liked the service and the vibrant atmosphere, but overall I would rather return for a drink and some appetizers than a plate of BBQ.