Sevilla - The mountain man is the one Queen pattern that has common problems with blade play. I have seen two (and own one) and both had some blade play. I knew that it was a distinct possibility before I bought it, so at least it wasn't a surprise.
Of all the other Queen D2 knives that I have bought or handled (three different #9 stockman, two different #26 stockman, two different copperheads, one gunstock, and one large two-bladed folding hunter), only one had any blade play. On one of the #9 stockmans, the sheepsfoot blade shows a good amount of play when closed, but when open it is hardly noticeable. So don't judge the entire Queen line by your experience with the Mountain Man, since that model is not representative of Queen quality in general. Normally the only issue is the obtuse edge they come with, which requires reprofiling.
I´m not judging, but sharing my experiences, lambertiana. I know for sure that Queen knives can´t be that bad when so many clever 'aficionados' say good things about them. But it doesn´t stop me from having bad vibrations about the brand.
Let me explain: I live in Spain, where postal shipping of cutlery is strictly banned, so bringing knives from US is hard and expensive. But I was completely 'in love' with the pattern, 'cause it had everything I wanted - lockback, stag, D2 or 1095, beauty and tradition- so I took advantage of an American friend that went holydays in summer and ordered my first MM to a vendor who supposedly handpick some folder if you ask specifically for it, as I did when I told him my special circumstances. Big disappointment when I received it and bladeplay was even noisy. I didn´t give up, thinking that everybody can fail, so I sold the MM to a coworker and, six months later and with that same friend, I asked for one MM else, explaining what had happened, and asking -almost begging- an item with the minimum bladeplay, without minding if it was D2 or 1095, stag or bone.
I was lucky: the new one made no noise, but in fact the bladeplay was there, both vertical and side-to-side, much more noticeable than a cheap Chinese knock-off.
Again, lambertiana, I´m not judging, I have no right, neither knowledge to do it. But I won´t buy a Queen knife in the future.
Anyway, I´m very glad you have and enjoy your Queens.
Thanks, and sorry for my poor English.