How useful can the shurikens be in fight with Ninja Rats? Well, here is a perfect scenario.

Ninja Rats are moving and jumping around like crazy, so it requires much skill and luck to catch a moment when it's possible to spam shurikens at one of the rats. I timed the spam in the way so another rat gets into the spam because, in order for the autoaim to lock on another target, the previous target must run out of sight. It's doesn't switch to a closer target like in TMNT 2003 (the first part)

The position between you and a rat near the wall must be almost pixel-correct for you to keep the spamming long.

Overall, the tactic of doing combo-dashes on one rat is faster than this. As turned out later, Leo and Mike throw shurikens faster, but this doesn't make the shuriken tactic competitive