Let's be clear that 2 UB vs 2 Reg on Prison is not so imblanaced as you might think when played right.
Although not the original purpose of the post, I will add some more details on the game.
1) You are almost always in perfect snipe range, even when they are regenerating at their crystal, so you will be eating arrows in the face constantly.
2) There is little manuvering room, so the enemy never gets caught with you inbetween them and their base.
3) The combat zone is small, so you really need to watch your step. Step on a shrapnel mine and you are making a trip to the healing crystal after being filled full of arrows, or worse.
4) The distance to a healing crystal from the battle field is close enough that even what should be a lethal spit usually allows them to not be done in by it even while returning to base on foot.
5) Towers are always close by, so when they drop mines and flee, you can't detour around them and catch them before they are safely in the towers. Then you eat snipes in the face and they come back fully recharged.
They also played quite intelligently. It was always focus fire on one of us, and the Reg with Saam-El's clock was always in the front so we could never quite slow him enough with diseased claw, wyrmskin gloves and foul grasp vs maim, wyrmskin and shrapnel mines to get a kill without one of us dying in the process. (when you are slowed, you are going to get 6 mines every single time)
All around the kill rate was quite low until the end of the game. Some notable exceptions include the first time we landed a chain foul grasp, the first time we stepped on a shrapnel mine, and the first time we used wand of speed to catch one of them in a mine throw animation.
We also owned the gold mine most of the match and used it to subsidize the Totems of Revelation.
At the end of the game we had more kills and gold, but clearly made the wrong choice in trying to weather their push with impulse defense upgrades rather than getting giants.
In this match Giants > level 3 tower health and damage, trebuchets and finger of god.