Not exactly true. The sale is for Memorex 3 single packs of DL media. But, at some stores they are substituting Verbatim. YMMV on that one with them. I'll find out in the morning.
I would try a pressed DVD movie in there before condemming the drive, it should be 6X-7X maximum. Or try a single layer disc as it should also climb upto 12X-14X.
IF it is still in the crapper, it could be a bad flash. Load up the FW in MCSE and make sure you really did check the speedpatch and flash it again. We have all seen stranger things happen around here.