I completed a "Crazy King" Battleground game a little while ago, where my pug group (though I did I queue with one person in a duo) faced off against 2 premades. The lowest damage on my team came in at 986.4k, while the highest was 1.2m in a game that did not go the full 15 minutes. The only time anyone on the green team was killable, was when they were spread out away from each other. Otherwise it was the same boring thing every time: Permablocking Templar as dedicated healer, second Templar as backup healer/dps (who also blocked quite frequently), guard on one of the DPS, and an extra 140k healing from the Magblade thrown in for funsies.
The permablocking Templar healed for 775.5k, while the frequently blocking backup healed for 391.6k (and keep in mind that self healing doesn't get counted on the scoreboard). So, contrary to what some players seem to think, permablocking does not require you to be nothing more than a bump on a log. That particular premade had a grand total of 9 deaths, and most of those were just when people were caught on their own. The permablocker was caught on his own a couple times as well, but only died once; he ccould generally tank 4 people + self heal/cleanse for long enough that his team could show up.
While the other premade also had a Templar healer, theirs didn't permablock and was therefore imminently killable. In fact, they were probably a bit too easy to kill - just like most everyone else that doesn't block, shield stack, or have good escape mechanisms. This leaves many fights in Battlegrounds being to one extreme or the other; permablocking healers that virtually never die on one end, and people exploding in 2-3 seconds on the other.
Running away from an objective because some dude is holding down his right mouse button while spamming Breath of Life isn't a good solution.