Yeah, but the description from Bronn vs what we saw was rather jarring. Yeah, I'd certainly run from that monster, but I'm no badass swordsman.
I lean towards the description, obviously, and just chalk it up to bad casting/bad directing in that scene. Instead of fast and terrifying, he really looked slow and clumsy...as he hacked at unarmed people cowering ont he ground, waiting to be hacked.
It's the same thing as talking up Vader to be the baddest badass in all the Galaxy, murdering all of the Jedis ever, then we see him in episode 3 murdering a bunch of unarmed children...while all the stormtroopers actually kill the Jedi. ...talk about let down.