I think CQB's PPM System is excellent! It does indeed work and goes a long way to prevent most action/arcade play 'Stylz that have no place in, and are not intended to be part of any serious Tactical Realism shooter. Anyone remarking that they perceive movement as anything resembling 'clumpsy and 150-kg like' is just inarticulate commentary, similar to commentary that calls 3D render artifacts 'lag'.
There are some aspects of third person animation that can look awkward or unnatural and may appear to some as 'clumpsy and 150-kg like' but this in no way effects how the game plays from the first-person which is surprisingly realistic. There also appears to be some small player model scale issues where some combination of the first-person camera, FOV scaling, and the actual first-person model sizes appears to be too large for the map.
On a positive note the scale presentation seems to also prevent effortless and unrealistic sprinting through doorways and tight areas, which in the real world is not only impractical tactically (from a life preserving perspective) but is physically difficult and awkward compared to most what FPS shooters offer, and is more difficult as a function of how encumbered you are, the length and size of the weapon(s) you carry.
Coroner perhaps rhetorically asks: "Will CQB be powerful enough to attract (new) players that perceive more realistic movement as a nice feature?", and while that remains to be seen as with any game that needs more then one map and one critical and well developed feature to appeal strongly to any audience (that doesn't know it exists) -- I've heard many positive remarks from TR Fan/Friends that eschew TDM, and I found the game surprisingly fun for TDM, and I like many of my ilk almost never play DM games.
With realistic objective(s), perhaps asymmetrical game-modes, realistic Modern Warfare like stance based leaning to go with the realistic movement, and a few more maps; there's no doubt in my mind that once discovered: R6 Fans, SWAT Fans, as well as many Ghost Recon, OFP and ArmA and Fans seeking CQ game-play will love CQB once they discover it.
in the short time i tested it, i've become quickly used to it and can do some stuff u sure wouldnt like to see 
(hint: try jumping from one metal-roof to the other in the middle of the map, some wouldnt even think of that but i made it in the first try within my first 5 mins of playing^^ and there's other stuff u can do..).
