Okay, here's why it fails:
* It fails for being a 'Gametrailers Presents' thingy, meaning it's gone 'public', i.e. beyond a fan thingy.
* It fails for listing credits, i.e. having staff, especially 'promoting' people.
* It fails for referencing DMC.
* It fails for using DMC music.
* It fails for (apparently) not continuing where part 2 left off.
* It fails for Tifa's face looking like something else's.
* It fails for Tifa walking like she's got a stick up her arse and/or Oum trying to model it like a model, but failing miserably and making it look like she's walking like she's got a stick up her arse.
* It fails for a failed Seph appearance look-alike.
* It fails for shit dots of shit appearing in Tifa, probably supposed to represent materia, but failing.
* It fails for looking like a recording from some fighting game instead of whatever it looked like in parts 1 and 2.
* It fails for seeming to be choppy, i.e. the part where what's-her-face 'omg bleedz' on the floor.
* It fails for Matrix reference, and a failing one at that for a lack in a beckon.
* It fails for a lack of breaking bones. Steven Seagal breaks bones.
* It fails for using AC references, and failing
* It fails for failing walking animation. Doesn't for ass.
* It fails for lack of awesome.
So, he spent years working on this one, but it failed in numerous ways. He should've continued in the same style as part 1 and 2, r'lyeh.