Sheeva is an amazing grappler. I would say she is the Zangief of this game. You can also check out Terminator he has multiple command grabs.
In what universe is Sheeva an amazing grappler?
No true command grab outside of v3, and even then it's situational
Her forward throw leaves the opponent nearly full screen which isn't ideal for her, and definitely wouldn't be ideal for a real grappler.
Her back throw is loopable but this also means its also the go-to break direction because...
..there is no risk really to breaking wrong. Sure you'll eat 14%, but oki in this game is two sided guessing game. She also doesn't have any KB's attached to her normal throws. A character that is so committed to the strike/throw game should have a real threat associated with their throw game. Lao is good example of this. Doubles down on strike/throw (cant mix cause no overhead) and has a KB on his back throw.
She's not a bad character persé, but she's far from an amazing grappler. She's more like..barely a grappler.