The .8 second gcd with the glyph is passable... except we shouldn't have an obvious dps gain glyph at this point according to their design model, but we need it because of how poor the cooldown is with current rogue mechanics.
I could maybe even see the .5 second gcd as reasonable if the game could actually handle it, but with the input lag (that really has just been an issue this tier? or maybe it just didnt matter before?) and the combo points on the UI not updating fast enough, a .5 second gcd during a brief period where it is absolutely imperative that you use every gcd is just bad design until at the very least they can fix the technical issues.