Regardless of how powerful a vanguard character might be, they are unlikely to be popular due to the high chance of 'glitching out' if not being the hosting player. Most people probably don't even know much about the vanguards due to this reason. Many posters here certainly do not know about some of the basic power abilities of the Krogan Vanguard.
Krogan Vanguard barrier power provides immunity to stun-lock. Geth Hunters, Primes, Rocket Troopers, Atlas rockets etc, inflict damage, but nothing else. Who knows why this ability is not mentioned in the game documentation.
Can get staggered and lose about 1 second of player control. This occurs from being hit by a charging brute's melee and some other similar major things.
I played this character almost exclusively for 2 months, on gold, without the Reegar Carbine. Usually a Disciple or Scimitar. Only recently did I find out that it was the barrier that was providing stun-lock immunity. Earlier I wondered why the other Krogan felt incredibly difficult to play as in comparison, especially versus Geth.
With all powers set to maximum survivability, the character is essentially immortal to all enemy that cannot sync-kill. In my experience, I have no respect at all for these enemies since they cannot harm me. Only flocks of pyros (2 or more), flocks of brutes, banshees and phantoms, feel somewhat dangerous.
I concur with the posters here who shared their stories of the outrageous feats possible. They are not exaggerating.
I stopped playing this character recently due to my belief that it is overpowered. Krogan Soldier is incredibly much more difficult to play as, especially versus Geth. Stun-locked to death at every opportunity. Being the largest and the least mobile and without ability to deal with their shields. Doesn't matter how powerful one's health and shields are as a Krogan, when being hit by a shot by a Prime means being hit by the other two shots, leading to going down or having almost no health left.
- The Krogan Vanguard has 400 more health (1600 vs 1200) than the other two Krogans for mysterious reasons.
- Barrier vs Tech Armor - detonation staggers enemies and does same amount of damage. Additionally, barrier will grab and lift any unarmored and unshielded enemies into the air, similar to a biotic pull. Additionally, barrier provides stun-lock immunity. Tech Armor can provide more power/melee boosts, and higher damage resistance.
- Fortification vs Barrier - fortification provides more melee damage boost (if switched off) and the same damage reduction. Inferior in all other aspects.
It is my belief that the Krogans require adjustments to bring them in line with other characters fabulous secret powers.
Krogan Vanguard: Biotic Charge base cooldown increased by 20%.
Krogan Vanguard: Barrier power recharge penalty increased by 25%
Krogan Soldier & Sentinel: Fortification & Tech Armor provide stun-lock immunity.
Krogan Soldier & Sentinel: default weight carrying capacity increased by 10.