Former Val player (yes, I've finally dropped her permanently, for Eliza) reporting.
Let's start with the one thing that's good about Val:
Val's reset game is utterly fucking terrifying -- on par with Filia's, possibly scarier. Best ground throw in the game, and j.mp ADC vs. Fastfall means endless high/low/crossup bullshit.
Why she sucks:
1. Awful assists.
2. Supbar defensive options. Flatliner has very bad vertical range; Scalpels magically whiffs in a lot of cases. Reset her on the ground, and she's toast.
3. Second worst damage in the game.
4. Despite being a point character, she doesn't have the power in neutral that Eliza, Parasoul, Peacock, or Fukua do. Or, hell, even Bella, Squigly, Fortune, or Painwheel (the latter of those two, amusingly, outright obsolete Val, being better in literally every single regard other than having a slightly weaker reset game). Her normals are consistently very slow for the amount of space that they cover. The end result is that her entire neutral game is "move around and call assists", which means that she takes over twice the risk of her opponents on every "poke". Oh, and if that assist gets clobbered, then she's really fucked, since she's useless without.
5. No block pressure. Her only + on block moves are on the lp button, and her s.mpx2, which is a free pushblock every single time (or, against some teams, a free alpha counter xx super).
At the end of the day, the question with Val is "what, exactly, is this character supposed to fucking do"? Her utterly ass space control game and great resets would lead one to think she rushes down, but she has absolutely no fucking block pressure (oh, and her jab is slow, lol). As it stands, she's Filia without Updo (either as the gdlk assist or as defense), Gregor, any kind of block pressure, and with inferior damage.