I know that this isn't a Phase 4 forum, but taking her to the lab looking at the stuff that she has for the sake of the interest in her, can actually be exciting but she will also make you appreciate what Kasumi is a lot more. She suffers a lot more than Kasumi in the safety issues & she's forced to commit to teleports & tick throwing about 75% of the time. The only category that I can think of off the top of my head that she beats Kasumi in is damage. Her air throw doesn't scale so don't be surprised if you see tons of juggling teleport T'ing enders. Still, in terms of neutral game, us Kasumi players have a lot to be thankful for in comparison to Phase 4 aka Kasumi Alpha.
Phase 4:
H+K, 33K, 3K, P, PP, PPP, 2P, 6P, 8P, 3P+KP, 66PPP+K & 2K are key on block since they're her safest bet. 3PP, 66K, P+K, 6PK she has to commit to if block & can be punished hardbody for them.
Kasumi:
P, PP, 6P, 4P, 3P, 2P, 3K, 2K, 8P, 6PK/PP6PK, 66PPP+K, 33K, 4H+K, 66K~K 4KK are her safest bet on block.
They're both great on the wall & ceiling. Another thing that I found when I was in the lab was Kasumi's parries vs Phase 4's important tools. When I parried 3P, it came out to +13 for Kasumi, add the 5 frames it takes to recover it's -18 for her. I parried H+K & it came out to be -7 add the 5 to it's -12. I also parried 1PP & it was -9 without the 5 frames it takes to recover. I don't expect Phase 4 to just chuck out 3P however since it's -8 on block or 1P (1PP) for that matter.
I mean just from 236T she can get just off of the simple juggle 4K 6PKT for like 93 on CH & like 70+ on some of her juggles just on NH. That's how strong she is. Honestly, the real reason why people want to play her (I do too but there's work still left to be done here with Kasumi) is because of the unique & stylish juggles. You already have people complaining about her when they were people that were trying to tell the whole entire time that her & Kasumi were 2 different characters, but share a few of the same characteristics. Now look, there are people already ready to drop her. However, at the end of the day, it will take someone who really & truly puts the time & effort into her to show how good that she really can be. I like her a lot though.