6-hit is easy with this. Rajas & Brutal for STP on WS = 15.1, meaning you only need 24 STP for TP (Providing you're 5/5 merits). You can even wear Sword Strap and easily keep 6-hit by wearing Unkai Haidate +2 for WS (Not everyone has Hachiryu Haidate anyway).
I don't know why Karbuncle feels the need to post crap on almost all the gear that comes out.
At the 2012 Vanafest, it was revealed that the Murasamemaru has the hidden effect of causing all weaponskills performed with it to count as non-elemental damage.
Interesting weapon. It's rare to see a high-damage Great Katana with a low Delay value. The 1636 DPS value is among the highest for any Great Katana. SAM isn't really a "DPS" job, in the traditional sense, since Weapon Skill frequency and Skillchain efficiency play a large role in Samurai damage output. Still, considering that STR+12 boost on top of the high Damage value, this may be a formidable choice of weapon.