This happens to be my first post, I hope I don't offend anyone. It seems that many people prefer the original Flourish over the Rigadoon and Flamberge. Not that Flourish-type weapons are common, since I rarely see them used in a PvE environment. I actually own a Rigadoon myself, but I only crafted it to mess around really. Turns out, it's pretty fun to use! The stun isn't even as "rare" as they make it out to be, as I find it to be rather common. I've seen the stats and stuff, and yeah, sure the Rigadoon and Flamberge have weaker base damage, and sure, they have "low" chances of effecting things, but they still do seem to be very fun weapons.
Also, sorry if my thoughts are scattered. I tend to drift off easily.
Fire is a completely useless status most of the time. It only adds damage over time.
Having a weapon that just deals more damage upfront is like the same thing, but better.
Then stun is a defensive status, slowing down enemies. A good player can kill enemies without needing to slow them down.
I guess they are fun weapon, but they ain't efficient. Many player only care about damage output.