Smashburger is a chain, but it's one I can honestly say I like.
First off, the burgers are pretty tasty. I don't like the smash-bit (I want every drop of fat I can have, please!) but the meat is so juicy and tasty I can forgive them. Plus, the variety of options for each burger (whether doing a build-your-own or a specialty burger) mean you could go twenty times and never have the same burger. My favorite is the Spicy Baja. They are definitely not the best, but as far as chains go I think they are - at least better than Five Guys and DEFINITELY better than a McDonalds or Burger King (then again, a two-year-old could make a better burger than McD's and BK.)
The sides are pretty awesome too - the rosemary smashfries are the best chain-fries I've had yet. Even the sweet potato fries are tasty, which surprised me since I tend to not like them. I love sweet potatoes, but sweet potato fries are usually soggy and gross. These were as crisp and flavorful as their regular potato counterparts.
But what really makes me like Smashburger is the localization. They've always had an Ohio-only burger and Ohio-only sides and sauces (the BBQ sauce is unique to each location, for example) but most recently they have teamed up with Christian Moerlein to have a burger-and-beer pairing menu and to serve exclusively Moerlein beers. They've earned a thumbs up from me.