just unlocked the auto sentry and i must say it is a very useful AA. it can take down sheilds pretty fast if you help it out. (which you are supposed to do) but ones the shields are down it is up to you to finish off the enemy. and i dont know if ths is a glitch. most likely lag. but my snetry even after i died was still freing at the person that killed me. so the sentry is great for:
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surprise attacks around corners.
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distractions.
3 assisting you in a fire fight.
- it also looks awesome when you deploy it. its like your going super sayian.
so go give it a go if you have a chance!