I don't know of any movies that I really hate. There are types I don't like, like basically every romantic comedy to ever exist because you know exactly what's going to happen in the end and they always have cheesy predictable plot lines (same goes for Disney Channel movies, which are also disgustingly stereotypical and unrealistic and lame and when they burst out singing in the middle of a class or something it makes me want to throw chairs through my TV which is also why I hate Glee with a deep passion.) If I had to pick a least favorite movie, it would probably be any romantic comedy I've been forced to watch, or..OHWAIT. Got one. The entire Twilight sage (although I only saw the first 2) is TERRIBLE. HORRIBLE. The acting is awful and boring and Kristen Stewart looks like a deer in headlights and the plot is unrealistic (even for vampires/werewolves.) I mean, in New Moon, Edward leaves or whatever and Bella's just like "oh, my boyfriend dumped me. Instead of being sad for a bit and moving on, I'm going to become incredibly depressed for 4 months and do stupid reckless things so I can see visions of him again." And Breaking Dawn basically comes down to this: "Edward, our demon baby has broken my spine! Quick! Make me a member of the undead that SPARKLES in the sunlight (don't even get me started on the sparkling.) and then 10-pack Jacob's all like "Wait, Bella! Me and your demon baby are soulmates!"
You can't help but sit there and think "Seriously.WTF am I watching?"
Also, I don't understand the dislike for Inception, I understood it perfectly and it's actually my favorite movie of all time (aside from my special Disney cartoons from my beloved childhood that I miss dearly.) But, opinions are opinions.