First, the plot is definitely quite interesting though some parts felt a little out of place. The pacing didn't feel off, nothing feels too stagnant. It's kind of like a slice of life with BL elements sprinkled in.
The BL element to all this is perhaps the most controversial part of this anime. Though Ren and Haru's relationship would certainly be uncomfortable and discouraged in real life, I found it interesting to delve into it in a fictional setting.
Though it may not be intentional, I found it interesting the more subtle ways their relationship could be considered unhealthy. For example, Haru's treatment of Ren depends on his own mood and feelings at the moment-- he'll shower him with affection when he feels like it, and neglect him if he's not feeling up to par. He doesn't show signs of being ready to be a guardian figure for him.
Their relationship can almost be described as codependent; it's clear that Haru clings to him for his own self-fulfillment, and he likely needs Ren more than Ren needs him. It's much like "throw a dog a bone once, he'll guard your house for life". He formed a bond with Ren during his formative years, which established a foundation for this relationship.
Ren is definitely susceptible to manipulation, and quite accepting of Haru's antics. He is utterly devoted to his wants and needs. In short, he's a very convenient person for Haru to lean on and take what he needs from him. While Haru does care for him and spoil him, it does seem like he's doing it for his own benefit just as much.
Super Lovers has caused divide among the anime community for its controversial elements. I personally find this anime interesting yet average. I found the plot quite uneventful and sometimes dry, but there were cute moments and the relationship between Ren and Haru was incredibly fun to analyse.
