The problem with Dilbert is simple: it is the truth. Yes, I really had a boss with pointy hair. Yes, to enter the marketing department, you really need a two drink minimum. Dilbert is not a cartoon about working in a large company; it is a documentary of working in a large company.
If things are going sad in your project, laughing over a Dilbert comic with your colleagues can be quite stress reducing. Yes, our corporate politics are killing morale. But look! We are not the only place were this happens! Shared misery seems to be good misery.
But make no mistake, it is a survival technique.
Once in a while a shot of Dilbert will not hurt your project; it will even be beneficial. But a office wallpapered with the guy is a clear sign of low morale. And we all know that low morale means another project down the drain. Saving Changes...
