Is BDSM better, equal-to, or worse than non-BDSM sexuality. Actually, that is a crappy way of phrasing it, and much less productive and nuanced than the way bean actually phrased it. Bean’s point was much more complex than that, but I think I can say something useful with this simplified version, so here goes.
I think that BDSM sexuality, independent of any other criteria, is a more harmful sexuality than non-BDSM sexuality. Specifically, I think that an eroticization of mutuality is a better and healthier sexuality than an eroticization of power dynamics (power-over, powerlessness, violence and pain). Furthermore, while I can see other sources for an eroticization of power dynamics, I think the overwhelming source of the eroticization of power dynamics in this culture is patriarchy (actually, I think the triple alliance of sex oppression, class oppression and race oppression are heavily implicated, but sex oppression is most heavily implicated). I think that if you have, or are able to develop, a sexuality of mutuality, then you should value it highly. I think taking up BDSM practice because it is cool is a bad mistake if you have or are capable of developing a truly mutual sexuality. I think in the ideal world, there would be no eroticization of power dynamics, and no BDSM sexuality. I think in a moderately ideal world (one where people still suffer through a childhood of relative powerlessness (but not abuse), where people still suffer from painful diseases, where people still fear death and loss, but where sex, class, and race oppression is banished) that eroticization of power dynamics would be far more rare.