The first Gamers movie is VERY rough. The second a bit less so. The third, while obviously low budget, is pretty awesome. They sort of embrace their lowbudgetness.However, you might be a bit lost if you don't see the first two. Or at least the second one.
I always point people towards this when they say something about DnD being Satanic
The trailer seems a bit weird, not sure what to make of it. I at least didn't find the satire in it. But who knows.