I think you answered your own question here... of course if you fly in F everywhere, B6 will feel like nothing special. You just can't compare an F seat/experience to any econ seat. If you were a peon who flew everywhere on discount Y fares, you would (likely) have a different opinion. B6, as a whole sends the message to peons with no status that they care about their business, whereas Delta, UA, AA, etc. give their peons the impression that they frankly could care less. And everyone has bad days, there are days on B6 where the crew or the plane may not meet expectations for whatever reason. But by and large, they give an overall pleasant flying experience to those who have no hope of flying the way the elites on the majors do.