I'm perfectly cool with the idea of more crossover content. Just make it completely exclusive to evil or evil looking sci fi factions. Like The empire from star wars or the Warhammer imperium. Honestly you don't really have to go that far for decent dlc.
They could just bring over the bad guys from Jak 2 and other PS sci fi properties.
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I like the approach of just pretending all this gear comes from super earth and isn't from another IP. Kinda like super robot wars in a way.
I am somewhat annoyed the strat for the missile pod gun is not permanent.