Vorcha Soldier - There are a number of ways to play the Vorcha because of his unique powers. I've messed around with his powers a few ways and this is one that I like for the Soldier.
http://narida.pytalhost.com/me3/classes/#15RODIK[9@0DA@@
Weapons: Reegar Carbine & Phalynx
SoldierBloodlust 4: Increase health regen with each stack by 50%
Bloodlust 5: Increase weapon damage by 5% with each stack
Bloodlust 6: Increase health regen with each stack by 100%
Flamer 4: Increase range 50%
Flamer 5: Increase damage 40% per second
Flamer 6: Increase damage to armor 50%
Resilience 4: Increase damage bonus 10%, increase weight capacity 20%
Resilience 5: Increase power damage 15%
Fitness 4: Increase melee damage 30%
Fitness 5: Increase melee damage 75% for 30 seconds after a heavy melee kill
Fitness 6: Increase melee damage 30%
Summary - Trying to make the Soldier and Sentinel classes different are almost impossible. Fact is you could use this exact setup with the Sentinel if you wanted since it's perfectly ideal for both.
But to distinguish, I made this more of a no-brainer class and the Sentinel more of a normal class. Bloodlust health regen is maxed out. It's almost impossible to die with the health regen and you have to do something extraordiniarily stupid to die. With max regen, a Vorcha can survive a banshee fireball.
His Melee is better than a Krogan's. He has a much further commando lunge, in which he locks on to his victim. A Krogan has to have someone directly in front of him. With near invincibility and a high damage lunge, this is the best melee class in the game.
In additon to health regen, bloodlust continues to "stack" with every kill. In other words, the more you kill quickly, the more powerful you become. Think of this dude like a psychotic serial killer or some shit from a strange movie. Sitting back with an assault rifle is probably the worst way to use him.
For Flamer, go with distance and avoid duration. Most boss level enemies approach you so distance will get them before they get you. Most low level enemies avoid you so this will get them before running away. Burn & Melee is a great combo. I choose to do more damage to armor, because the Reegar takes care of shields and barrier.
The Reegar makes this class unstoppable. You basically have 2 flamethrowers, 1 which damages shields & barriers, the other goes after armor. The Phalynx and Carnage are your long range powers in case you get bogged down inside an area download.