Their only valid point was that Bitstamp didn't send an email to warn about that, though apparently they warned about it in their site 1 month in advance.
Or you have found reports of actual wires not going through for other reasons?
Seems like there have been a variety of complaints about general suckage, and I think that to 'gox' means to suck in a variety of ways...not just whatever Mt. Gox's primarly current failure mode might be.
Now, it is well worth note that in the case of Bitstamp and almost every other business, one needs to look for a pattern of complaints, or from complete information from a reputable complainer in order to gauge the level of 'goxage'. Over the years that I've been watching, Mt. Gox has fucked with people who in some cases probably do kind of deserve it. I will not look down on an action which interferes with a criminal's activities, particularly if the activities involve use of the companies services.
It should be noted that sometimes the attempted harassment by companies is misplaced. Like when Mt. Gox tried their hand at taint analysis and started locking up people's coins who were completely innocent. My own BTC (which passed through Tradehill) would have been impacted had I been using Mt. Gox at the time. To Mt. Gox's credit, they understood and remedied the problem quickly in that case.
Secondary observations can also be of value. If Bitstamp has achieved a high 'Gox Index', the downward pressure on their spot price would subside. Of course these sorts of things are only observable with a lag time though.
What if it was an inverse gox? For example, you'd agree that due to the original definition of 'goxage' equating to suckage in a variety of ways, then wouldn't, for example, making withdrawing BTC overly difficult equate to goxxage all the same, despite it having an inverse effect of the price? As such, the downward pressure on their spot price would not subside, it could potentially increase, despite an increased gox index.