Guren has interesting unique skill set, that 30 combo chase is harder to trigger.

3* makes her usable maybe but in the end it depends how hard she hits with each atk/chase.

I remember when kakashi anbu came out, i was thinking of chases,

but turns out his hits do very low damage so its pointless even if he can chase many times, unlike itachi anbu

4* she best hit after chakra drain viable if she go second (or after her chase drains). I'd say potential trouble maker XD