I have seen rare weapons drop even in failed missions and best way to play this game is by queueing for ALL AVAILABLE missions. I have never queued for same mission (actually I usually queue for all missions except last one I had joined before) and I think I miss 2 or 3 blueprints from all the characters that I've unlocked.

Off topic, but I have seen new players try to kill tanks with their guns in Loaht rescue mission. Not just shoot the tank, realise you can't damage it and move on, but empty entire clip, reload and keep trying until out of ammo.
At first I was like WTF but then it kind of was hilarious to look at.

The mastery stuff is very easily to notice - you either have full map of mobs when playing with decent players or just 3 mobs on 4 players when you get noob team which still struggle to understand the mission objective written on the top right corner.
I have to admit that it feels much better to play on high mastery player filled games with lot of actions and 2x rewards.

At first I noticed that there is a new Free To Play game on store, but I skipped it multiple times just because it had no print screens or video in the store. Then at some moment when I realised that I have absolutely nothing left to play I googled this game, saw some trailers and downloaded it.

The problem with PS store is that the game has no video or screenshots and the Lycus Dion face somehow doesn't catch attention as well. I'm pretty sure that many people actually do skip this game because of those things.