Unlike normal missions where it's feel like 4 men doing a 1 man job, the missions to retrieve Grendel is challenging in a fun way.
It promote team work, communication and proper strategy. You cant just go in willy nilly and expect to survive. For example I ran with a Trinity and Mesa for the defense mission, my job was to manage my 4 and keep and eye out for nullifier, Trin provide energy and shield, Mesa killing the bursas and other enemies.
Warframe has and will probably continue to be a multiplayer focused game, and more game modes or missions that promote such concept would be nice, a good example would be eidolons hunts and a harder mission that require proper coordination would be really fun.
what do you think ?