Maybe my ignorance of the director keeps from looking for cynicism(though I will be watching dogtooth soon),but I didn't get that at all. And I don't see how it cheapens love when they lose their eye sight to obtain it. And I completely disagree that its about rebellion, for me its about true honest love. The last 10 minutes of the movie is him methodically preparing to give up his eye sight. This begins with him describing the moves he would make to tell her how he feels. They have broken conversations assuring each other that this is what he wants to do. The last scene is her offering body parts for him to look at for the final time.
Look at it another way, in comparison to the nose bleeding couple: They lie(he does) about their "perfect" relationship. When Collin Farrel arrives on the boat, its almost implied that the wife knows the man has been lying, but to continue being the perfect couple and matching in every way, they have solidified their bonds in alliance against those who would destroy it. Its why the daughter offers the knife, the children solve all problems, and now he must fight for her and them as a family.
Now compare that to Farrel and Weisz' relationship. They knowingly make the choice together to become the perfect couple because the outside world demands it. Farrel could easily move on and live his own life, which would be the "rebellious" thing to do, but he willingly gives up everything for her. That he blinds himself for her, with her in accordance is the sweetest thing he could do. I also think he does it because the end credits are beach sounds, and the movie establishes that animals never get put in their natural habitat. Also lobsters are blind.
An entire movie built on the premise that you can change a human into an animal, and not only do they never show the process or the machine, when the main character uses it, John C Reilly can only utter his disgust at "what he did." I think the movie's view of the rest of the world as mundanity aside from whether or not you're in a relationship, to the effect that police force are patrolling for it, is something worth thinking and talking about.
It's worth pointing out that the master plan to disrupt the status quo was to introduce distrust, not just make up a lie, or kill, or steal, just leave them with the knowledge they don't truly love each other the way they think they do. It's also interesting the leader has a "perfect" family herself, and yet lies to them and actively works against the thing they enjoy.
I disagree with the sentiment of having a point to analyse art. Art is created for you to react and respond to, whether you do or not is up to you, but even some of the "worst" art has analytical value to be gleaned.