In the last Howling Commandos issue Dum Dum Dugan knew Pleasant Hill was a prison however thought it was your average prison not knowing about the mind and reality wrapping and found out the hard way when rescuing a team member that got unjustly place there. During the Standoff saga while other teams are setup to be fighting other teams (ANAD Avengers vs Unity Squad and Agents of SHIELD vs New Avengers) this team had to battle against the strongest and most dangerous of them all. spoilers:end of spoilers
The KOBIK goddess girl herself! She is not pleasant or innocent (or wasn't properly educated and taught a strong moral code and moral responsible of her powers as Maria used her as a tool for her whims).
Plus adding to the recent ANAD Avenger comic possibly it is she who is pulling all the strings. Hill herself might be a long term victim and first prisoner of that town and a puppet for the girl. She might be trying to lure both classified "good" and "bad" into her fun perfect happy town.
In Agents of SHIELD Coulson like many others was told and believed that the KOBIK program was scraped and didn't know about Pleasant Hill and wasn't happy to here about what Maria was doing at all. Coulson wanted to see Rick to confirm about what he heard while managing another big mission and things went off the rails from that. I like that when looking into SHIELD as a whole the organization itself has many people within who want to do good vs treating like it's one mindless being. It's more complicated then black and white that some of the characters and other teams have treated them as such and that inside there are individuals who has their own options/beliefs and moral code (and Maria knew that they would object and possibly try to stop her thus she lied and hide secrets from them for her own beliefs).
This saga like many people have wrote might have her lose her dictator position or cause a major rift within SHIELD. Maria SHIELD vs Coulson SHIELD and be apart of the upcoming Civil War 2 event