Over the last 4 years I've played this game, I've built 6 or 7 different Jail Breaks and played in dozens of different ones. I've found that the best ones are not always the best built but have the best game play. This usually means a slight challenge such as being able to hide and sneak around the map and the only OP weapons are knives with a one hit kill if you get the guards in the back. Also when the guards have a huge advantage such as a freaking tank in the middle of the courtyard it hurts the game. The best Jail Breaks are the ones that balance out the game play with lots of places to explore/hide/do stuff. Also most of the Jail Breaks are all the same, no one knows how to come up with new ideas for rooms or the style of building or game play. One last thing getting an opinion from your players is Key! If you decided to keep an element to the game play they don't like. obviously they're not going to like it. Change the element and if it doesn't work out throw something new in and see if they like it.
With that all having been said I'm a 3rd of the way through my 8th jailbreak build and i'll be posting pictures soon. I'm changing up some things and adding new elements like throw mod. Not sure how well it'll work but we'll see!