I tend to dislike the ones where they just have the cast sprawled out on the box, and there doesn't seem to have been much effort put into it. Especially those that put the biggest star but sometimes smallest character rights at the front.
Another I hated was this.
The story is about a bull shark. THAT IS NOT A BULL SHARK! And the funny thing was, they had the shark pretty accurate in the actual film. The only reason they put that on is because it looks scarier.
As for the lampoons, the only lampoon films for me are the ones with the Griswalds!