Granted, I tend to skip movies that are released during the "Crap Season" (usually between mid-January and late March) so I'm sure there was plenty of garbage that I didn't see that is worse than the following films. However, I did see a couple of movies released during this period that were awful:
Friday the 13th - uninspired garbage from start to finish (though I suppose most of the F13 movies are like this, so it does at least fit in).
Paul Blart: Mall Cop - it should have at least been funny. It wasn't.
Now, onto the summer...
Transformers ROTF: Look, I didn't expect this movie to be great, or really even good. I just wanted it to be fun. And I was still disappointed. It was moronic in pretty much every way possible... the story was so stupid that you have to actually make up excuses and scenarios in your mind to fill in all of the plot holes. The characters were pathetic. I actually don't mind LaBouef or Turturro... but the roommate character, the Twins, the soldiers, Sam's parents... were all just flat out annoying as hell. And the effects? They were good, but it really is true; when you have two of the robots kicking the sh** out of each other, it's damn near impossible to discern what is going on. Maybe I just need to get better contacts, but all I saw were balls of junk rolling across the screen.
Drag Me to Hell: Yeah, I said it. I know you all loved this movie. I don't care. Before you give me the "It's Sam Raimi! It's not supposed to be good!" defense, let me break it down to all of you aspiring filmmakers. Let's say you created a movie on shoestring budget in film school with no plot, that pretty much looked like crap and was chock full of bad acting and minimal dialogue because you couldn't think of enough lines for the cast. Then somehow, that film gained cult status and you were able to make more films. Fast forward 20 years or so and you have millions of dollars at your disposal. So what do you do, now that you can actually make a "good" horror film? You make the same stupid bulls**t you did back then, with a fairly similar demon possession plot, with claymation-looking gore, and you don't even try to get a committed performance out of a single one of your actors. Because when it gets down to it, you're not as great as all of your diehard fans think you are. Because you've had a script lying around for a decade or so that you never bother producing since you knew it was Grade-A crap, but then you figured, what the hell, make it anyway. People will go see it and love it because they want to see crap.