I've played all of them except Valkyria. Both Kingdom Hearts games were easily two of the worst video games I ever played in my life.
The Souls games are good (Demon's by far the worst) but they control & run very poorly in comparison to real Action games. If Souls games were 60 FPS, had overall tighter more responsive controls & gameplay they'd be amazing.
As my avatar may suggest, I am a huge fan of Kingdom Hearts. How far did you get into KH1 before quitting? It takes some time before the game gets good. The game is boring when you're on the island or even when you get to Traverse Town.
Also, Souls games are best SP games of last gen. Don't care what you want to put up in front for comparison but nothing compares imo.
As far as Valkyria Chronicles, it's a very different type of action rpg.......or, more so, it can fall under different genres. It's a turn-based, third person-shooter, strategy action-rpg.