68 Shiratsuyu games got me from Hatsuharu to Akizuki. The stats are in:
Will WG hit this ship with the nerfhammer? Because I can't be the only one posting these kinds of numbers. Which would be unfortunate: Shiratsuyu is a pretty great ship.
(Fubuki and Minekaze were some of the first ships I played, back when I was a complete scrub. Ignore.)
Considering Shiratsuyu as 90% of a Kagero and considering that Kagero can more than hold her own in T10 games (I have a 68% WR in Kagero to prove it) and you have to conclude that Shiratsuyu in T5-7 MM is more than a bit OP. Specifically, TRB is OP. Load up on premium TRB consumable, SI, reload buffs, Shira is dropping 8 torps every couple of minutes, and spreads of 16 fish four times a match. It doesn't take a whole lot of skill to convert that into a victory, even before you add the spotting damage and some reasonably potent gunnery into the mix.