I find it goes great as you fire the spread and BO3 someone before they hit to knock down the shield facing. Then the spread hits for around 10-45k depending on crits, shield regen, etc. Normally if I time it right it ends with either a one hit kill on the target or severe damage that immediately puts your enemy off balance.
Ts3 can hit 9 targets 4torps each, at max I could fire 36. Higher chance to crit.
It are only effectively 9 "attacks" that could crit. The visualization is 3 torps per attack, but it's only one attack. 9 attacks is the extreme, but 3 or 6 attacks still mean 3 or 6 more opportunities for critical hits - with a pretty big damage load.
I think Beagles explanation regarding the OPvP tournament is pretty logical here - the best build to use this are shield drainers with torpedo spread. Charged Particle Burst makes mutliple enemies shields weakened, so you have plenty of targets that could be significantly hurt or even destroyed by a critical hit.
Escorts won't be able to use it as well, because msot of their damage is focused on one target - The likelihood that you hit that one target with a torp spread crit is just as high as hitting it with any other type of crit. And any other targets hit most likely will be at high shield strength and not be overwhelmed by a random crit.
Maybe a good team build would be something like one Escort with Spread 3 and several Science Vessels with CPB. But maybe Spread 3 really makes no difference when there are no more than 5 player targets anyway, and each SV can also launch Torp Spread 2.
If only TS with 4 torps to target made Chronitons effectively get a 100% proc rate (it doesn't I've checked, still seems to be 33% as it treats the 4 torps as 1 unit). Across several targets, that would be soooooo effective, perhaps too much though, probably why it is as it is.
Oh well I can dream...
I'm wondering what transphasic bleedthrough from 4 torps looks like now, will prob have a play around when I get home.