Batarian Vangaurd Platinum Build - Support Build with High DPS

Charge (Rank 1): N/A
Annihilation Field (Rank 6): Radius, Damage Attractor, Draining Field/Shield Replenishment
Flak (Rank 6): Damage, Armor Damage, Shredder
Weapon Training (Rank 6): Powers, Ammo/targeting, Weapon Specialist
Combat Fitness (Rank 6): Health, Defensive Positioning, Hold the Line

Equipment: Vulnerability VI (40% shot to the face damage boost)
Primary Weapon 1: Piranha (Siphon), barrel/smartchoke
Backup Weapon 2: Hurricane (Siphon), barrel, scope
Ammo: Incendiary

Playstyle:
- Annihilation field gimps your charge's recharge speed. Don't try to fix the gimp with recharge boosters and make compromises on annihilation field. 1 point is enough for charge and it serves its utility. Be conservative with charge and be cautious when you use it to get in close to a mob (for the annihilation damage attractor bonus). You can also save your 1 point charge for that oh shit split second, where you charge (get 50% shields back) and evade/scram/run to a safe spot. Once you're close, you got the 20% damage bonus from annihilation field for 
1) Your Flak face shot
2) Your Piranha face shots
3) All damage from squad (very crucial)
4) In addition, you and all the boys sitting in your field will get their shields filled up as well as you wreck stuff.

- You can also be more conservative (depending on mob ferocity), sit back and let things come into your field. As we all know, this happens very quickly in platinum. You wouldn't wait long, before adhis start mauling you from behind anyways. Flak and Piranha away till everything's dead. If there's someone squishy hanging out with you, he'll be thanking you for shields.

Other Thoughts:

- Charge is a bit dangerous for this guy on platinum (unless you have another tank from your squad following you close). He doesn't have the Krogaurd's rage or fortify. Hold the line can only go so far and you can easily get overwhelmed. And Rank 5 charge only gives you either power synergy or weapon synergy, can't have both. With Annihilation field, you get damage boost to both weapon/power boosts and your squad's damage. Tis a no-brainer. Don't be a risky selfish charger. That works better on gold.

- Get a good feel for where your annihilation field perimeter lies. Slide up close enough for bosses so you and everyone gets the 20% annihilation boost (Slide away when they do something dangerous.) Support/assist/etc scores will rack up quickly and you can top the scores with this build pretty easy.

- The stupid melee is too slow and dangerous in platinum. Use it for style point biotic explosions when something's at its last leg of life or for crowd control of weaker enemies.  But, your primary sources of damage are your piranha and flakshots boosted by annihilation.

God bless....


EDIT
Anything that dies within your field's perimeter (~ 5 meters) triggers 30% shield meter replenishment over 8 meters (shield radius > field radius itself, they don't have to be hanging out right inside the field). That's a 16 meter diameter circle and a relatively large area wthin the map.  This lets your squad play way more aggressive when they are within this 16 m diameter circle centered on you.