I enjoy Discogs for many of the same reasons you do. But grading isn't one of them. Remember that albums are seldom play graded, almost always visually graded. And of course that means we are guessing. The seller is guessing how it will play based on what he or she sees with their eyes and the buyer is guessing based on what the seller sees with their eyes. But when we walk into an antique show, record store or yard sale we are doing the same thing. When you send feedback on the purchase you have the option to automatically enter those records into your discogs collection. I always clean and then play the records I buy but I'm often way behind in that process so it might be weeks before I actually know what I have regarding condition. Once I have done that I put the records in new inner and outer sleeves and write out the title, artist, label, year & play grade onto a small address label that I place on the outer sleeve. So I have my computer out and look each album up in my collection to get all the correct information. About 90% of the time the grade the seller gave the record and the grade I give the record or off at least one level, sometimes two. NM is almost always VG+ or VG, VG+ is almost always VG. Interestingly, the few times I've bought a record that I really wanted badly and was VG according to the seller, they have almost always been VG or VG+! Sometimes those NM records don't even play through without sticking or skipping. Now remember, the record was visually graded and sure enough they look pristine but skips/repeats are problems deep in the grooves so how do you fault the seller?