Time will tell I guess, I looked at the typically thought of as bottom ten characters and I can't think of who she'd replace in the bottom.
I guess the more important question is, whose better than her?
I think Jade's better than we originally thought, but Jade literally has no actual 6-4 match ups in her favor, she goes even with the zoners of the game(even Noob because she cannot zone him, just like he cannot zone her he can punish rangs on reaction). She doesn't beat any of the zoners despite having flash and rushdown characters with fast advancing normals give her problems, I mean I had her losing to Sonya and Cage 6-4, but I saw several people saying she loses those 7-3 in the tier lists from REO and others.
As for Stryker I think Stryker might have one 6-4 match up in his favor against Kano. The rest are either even or slightly not in in his favor like Sonya.
Sheeva has no favorable match ups, only bad and a couple even (mostly with bottom tier characters).
Not sure on Kano, Baraka, Noob, Scorpion, CSZ, Nightwolf etc. I don't play them so I have no idea about their matches.
I dunno man, I'm not saying you're wrong because the game is constantly evolving, I just can't ascertain who she's worse than most of the bottom tier have very few favorable matches, while Mileena seems to beat Noob, Jade, Sindel, Reptile and several other characters.