How is that different fom garrison invasion? They were also mindless AoE bombing for most of the time.
The only thing I miss with Sentinax is a rep grind. 10 rep per small portal, 25 rep per big portal, 50 per elite portal, and I would be completely happy. Yes, a stupid mindless grind is something I enjoy from time to time, it allows me to sit in voice chat, make fun, laugh, do shit tons of Dps and generally have a good time and also get something in return.
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Just tag them yourself. You do not need to do it alone. Get 5 ppl into a group, and you should have more then enough instants to tag everything constantly.