Oh, this is a tricky one, isn't it??? I might be wrong but from what I've picked up travelling and trying different things, craft beer is kinda like... smaller scale, you know? Like, the big corporate breweries make your 'regular beer' with super consistent recipes, aiming for mass appeal, so its often quite similar everywhere you go.
But craft breweries, they're usually independent, smaller, and they often experiment with ingredients more! Like, different types of hops or grains or even adding fruits and spices! So your craft beer might have a much stronger flavour, or be really hoppy, or even taste a bit wierd! If you only tasted one, it might not have been your cup of tea or it could have been one that tasted more 'regular' if that makes sense? It's not just a marketing trick, I don't think, because there are so many unique brews out there! Maybe try one from a local independent brewery, they often have some really epic stuff! It's all about finding your niche, like finding the best hostel, am I right?!?