"All change is not growth, as all movement is not forward"
Doesn't the truth hurt sometimes? That's how this is making me feel. You don't want to hear your work in progress is full of 'fluff'. You shake your head in disbelief as a beta reader tells you there needs to be 'more'. But it's the truth. It's sole purpose is to better your writing. Take heed to those giving you their opinion of your work. It might hurt but it could also be your saving grace. Now, don't take this wrong, I'm not saying you should scrap your work & start anew just because the feed back was not what you wanted. Use your own digression, a handful of common sense & always your gut.
The link below ties into this post a tad bit. I highly recommend reading & learning from the said link.
Best of luck to you!