Those IC² armored mobs are good for fun (in my opinion), makes us scared of mobs once again =D. However i think those mobs should have a better AI (hide themselves, ambush and such), use more IC² items and ...
To addon devs (and IC² ones maybe) : make those quantum/nano armor mobs drops have a special feature (either enchantment, ability or anything that can't be made). This will encourage players hunting those mobs [One more thing as time-sink (like IC² crops)]. Also possibly make those dropped armors be "damaged" ,which needs repair (cost slightly less than making one from scratch).
Villagers could also have a better interation with IC² with villages grow up in tech and size as you trade with them (trade-o-mats) [maybe some kind of millenaire integration?]