Some covers I
HATE...
Dodgeball The poster I saw for it's theatrical release was so much better, with a simple shot of a guy laying flat on his back with his feet in the foreground. That poster made me laugh.
Money Train Since Jennifer Lopez "made it big" since this release, they put her big noggin on the cover (this was her first film BTW), leaving poor Wesley and Woody to play second fiddle. Luckily, the inside isert had the original artwork (with Wesley and Woody running in front of the train) so I inserted it into the plastic on the cover.
Another vote for all of the
Jurassic Park covers. Yech!!!
The cover for the
Speed 5 Star DVD is aweful, especially when compared to the laserdisc cover where Keanu and the bus got equal billing, I mean afterall, the bus was also a star of the film in a way.
I'm glad that Universal didn't mess up the cover for
Three O'Clock High too badly, it still has the funny shot of Buddy grasping Jerry in his giant fist, but they chose to remove the artwork of the school in the background, now it's just white.
Ditto for
Robocop. I've always loved that classic shot of him stepping out of the police car with his head looking directly at us.
One more, I hate the cover for
Rudy which is one of my favorite films. It's not even Sean Astin on this cover! I don't know who it is those players are carrying, but it isn't him, and it isn't the real Rudy either.

I love covers that best represent the films and make you want to see that film. Two quick examples are
What About Bob?, simple and very funny, luckily they kept it for the dvd cover. And also
Swimming With Sharks with a simple shot similar to 'WaB?' with Kevin Spacey screaming into the face of Frank Whaley.