how would you grade the packaging. very good or poor.

Wouldn't that depend on how that specific book was wrapped?  Some would be very good some would be bad so I don't really understand your question.  It's a case by case basis.

Honestly I don't bother with the survey stuff unless the book arrived damaged. 

Like Mary, I am not sure I understand the question, but to generalize 95% of the books I receive are well wrapped, the remaining 5% are lucky to have arrived. Those are usually books placed loose in a manila envelope that is partially opened by the time I receive it. I do let the sending member know that their packaging is jeopardizing the book's safe arrival.

Be kind when letting a person know the package had big holes/falling apart or whatever. 

They will NOT appreciate it if you use blaming or demanding words or tone. Explain to them in a helpful way.  

Thank them for the book also. 

Not sure I understand the question, but I agree with Sally "...to generalize 95% of the books I receive are well wrapped, the remaining 5% are lucky to have arrived..."

If you feel the need to contact the sender, a polite comment like ' the book arrived safely, but the single page wrapper/loose manilla envelope/etc. was damaged.  Thankfully the book was undamaged (or, unfortunately the book arrived damaged)...in the future you may find it helpful to use more tape/fold down the envelope snug to the book/ etc." are common messages and usually well received if the wording is nice.

I agree that most books are wrapped adequately and appropriately to get the book to me safely - I'd say 98%+.  But I'm not overly picky, and don't need plastic lining, etc.  If the book arrives in condition that I can read it and pass it along to the next person, I'm happy.

I agree, if there is a problem, letting the sender know in a kind fashion is received much better.

I don't keep close track of how many books I receive that are either well packaged or poorly wrapped. However, I would hazard to guestimate that about 80% to 85% of the books I receive are well or adequately wrapped, and perhaps about 15% are sent in overly large envelopes that allow books to slide around, often without additional internal protection or even a plastic covering or bag around the book. Most of the latter still arrive safely, but some come with bumped corners that I suspect occurred because the book was sliding around loosely during transit in an envelope that was too large. Some of these packages arrive with tears in the envelope that exposed the books either to potential or actual additional damage. Only in perhaps 2% or 3% of cases the books I have received were wrapped poorly enough to cause me to include a comment about the packaging when marking them received. When sending comments about poor packaging I always try to explain in a helpful way what the problem was and how the packaging could be improved in future trades.