I like cliffhangers if done correctly, and sparingly. Oftentimes certain episodic media are structured for every episode to end on a cliffhanger, and that can be bad execution. I don't mind one episode ending on a cliffhanger every now and then, there is a balance that has to be found so that certain narrative devices don't get worn out in the story.
Now for a large scale piece of media, like a movie, to end on a cliffhanger, that can be extremely annoying. I feel like even if the movies are just parts in a tied plot, each one should still work individually by ending at a point that both makes people look forward to what will come, but also with some kind of resolution to whatever the main struggle of that film was.
I'll use The Hobbit: An Unexpected Journey as an example. Bilbo Baggins joins a group of dwarves who are trying to reclaim their Mountain that a dragon stole long ago, they embark on their journey, and the rising conflict is that they are being hunted by a group of orcs lead by Azog the Defiler. Towards the end, the climax occurs after the group escapes the Misty Mountains but ends up getting caught and cornered by Azog and his group of orcs. To make this a cliffhanger ending, the movie could cut off with Bilbo and the dwarves stuck in the tree they climbed that is being uprooted, Thorin unconscious from battling Azog, and Bilbo and a few other dwarves trying to save Thorin but their chances of survival are slim to none. Ending the film here certainly would have viewers wondering how the group will escape that situation, but it doesn't resolve any of the issues the film has brought up so far: mainly Thorin not considering Bilbo as a productive member of the group, and Bilbo's own doubts as to whether he is really being helpful at all.
The way the movie really ends is much better, the eagles swoop in to save them, Thorin finally acknowledges Bilbo and thanks him for leading the rally to save him from Azog, and then the group spots the Mountain in the distance. Some things are resolved for now, but the Mountain signifies what lays ahead.