I did between 5-6 Osiredon yesterday and received one drop : the Smiling Moon Blade. Thus far I think it's in line..
I'm getting a drop 1 in every 5 Osiredons. I wasn't happy about my run yesterday after receiving a drop on the first Osiredon and then nothing on the next 4.
So Osiredon is dropping them! I have compiled 3 one tiles Forges, 1 Leviathan Hide Bracers, 1 Enchanted Coral Bracelet and 1 Smiling Moonblade. I've also tossed close to 100 White Nets and seen approximately 30 Osiredons.
So I've done a boat load of Osiredons (pun intened) and would like to have received a few more drops but it wasn't meant to be. Osiredron's drop rate is fine imo and it's nothing compared to other spawns...specifically..the Twisted Weald.
I know there are players complaining in other threads but these items should be rare and hard to come by. I have had many many runs of 0-12 and I have gone 0-80 in the Twisted Weald on Balhae! I've fared very well on Europa Twisted Glade spawn.

Balhae Twisted Glade spawn needs looking into..
Powerful items should be hard to come by and Osiredron drops some very nice stuff.
Take a look at what has happened with Kelp Leggings. Kelp leggings are a very solid leg piece and you can't give them away. Kelp Leggins basically have no value because they're so easy to get.
If Kelp leggings were a rare drop it would be an extremely valuable and coveted item. The value of the Kelp leggings were ruined imo because the drop rate on them is so damn high. The special chest that drops from fishing has more value than the items in it! Seems a bit crazy and ass backwards to me.
I see so many items out there for sale and I wonder where the hell they all come!? Where people find the time to farm these items?
That's why I'm reluctant in advocating an increase in the drop rate on replicas and Boss/Peerless rares.
I don't know what the answer is. A ToT point system worries me on one hand that it will flood the game with drops yet on the other hand I'd like to see a little more consistency.
I'm not happy about going 0-80 in the Weald, 0-60 against Tikitavi, or 0-60 against the Renown Wyvern. But it is what it is...