They've changed it up some but I've always felt Brooks Brothers has had a certain stuffiness to it. It's more conservative, I think of middle aged men and preppy southern frat boys as their demographic. I mean, even walking into a store with its color coordinated tables of ties, many of which are very ordinary, shelves full of oxford shirts and racks of navy blazers and khakis . While they finally discovered the idea of a slim fit shirt, it took forever for there to be any actual stock in store. Then they realized that maybe their slim fit wasn't all that slim so they needed to add an extra to it. I don't think I've gone in one lately but it seemingly took forever for the stores to carry any of those too.
Brooks Brothers is good quality at a decent price but IMO there's a certain rigidity to a lot of what they sell, it's generally a little boring.