To say that they're virtually guaranteed to cause problems is grossly exaggerating. I know that Memorex is not liked, but most of the media they use is decent, the issue is a problem of not knowing what media code you're going to get so you can't pick and choose what might be best suited to your particular burner(s). They're probably RICOHJPN R03 or CMC M01, though there are other possibilities. CMC M01 can be good to marginal, depends on the batch - my Memorex CMC AM3 discs are the best among about 5 brands and burn very well, but I've not tried CMC M01 from Memorex so I don't know how they are from this brand. RICOHJPN R03 that I've used from Memorex is good with a couple of harmless PIF spikes raising PIF totals up to around 1-1.5k. Other possibilities include MBI (usually burns well), Prodisc (very burner dependant but can burn well), Philips (haven't used their 16x media and don't know much about its performance), MCC004 (good but unlikely to get), possibly Optodisc (burns very well). MIT should rule out MBI though.
Would I suggest 16x Memorex to someone, considering there's no way to identify the media inside without opening? Only if it was a great price, otherwise no. But that doesn't mean that the media is junk, most of the media codes used are decent, it's just a matter of not knowing what you're going to get. The only reason I bought any in the past was that I got them for $10 per 100 and for that price I was willing to settle for whatever media code I got as I know that my burners will handle them ok. With a newer burner, most of these media codes will burn just fine. If you have an older burner then you may run into some problems (which is true of a lot of 16x media in general with older burners).
P.S. - I'm sure someone's bound to misinterpret my point. As I said, I would not specifically tell someone 'go buy Memorex'. But redsandvb already has these discs, and there's no reason to imply that these discs are going to be horrible, as most of these discs will not be problematic in combination with a newer burner.