Hey, think of it this way. Midway are not saying that "these games perform badly on GC." Rather, they're pretty much saying "Xbox and PS2 owners are dumb enough to buy any flashy crap we put out, and we want to continue making crap, so we're going to continue publishing on the Xbox and PS2."
Now, is that so wrong? Now, they're obviously not going to blatantly call their own games crap, so they're going to blame the system. And what does that really mean? It means that the people who *own* the system are too smart to buy crap.
So, really, they're complimenting GC owners.