Do movies have to be enjoyable to watch? I would say no...
Um...then what exactly is the point of film, if you don't want to watch it?
I saw "Scanner Darkly" and I thought it was interesting at first, but it just didn't seem like anything was happening. Just a bnucha guys either getting stoned, standing around with their thumbs up their asses, or both. I almost fell asleep, and I never do that in movies. Ever.