First of all excuse my english.
So,I've spent more than 5 hours in the raid with a half random group which I happened to join through shouting LFG in chat. For me this 5 hrs was the best I had since the launch. We've beaten 2 bosses and tried 2 hrs on the third.
The mechanics and the difficulty are worthy for a raid. People really have to brainstorm and play together to beat the bosses. I think matchmaking should be allowed but a whole differrent type of it, I mean we should have something like in WoW where you can advertise yourself: "Hey guys I have mic, I can play in a team! And I have XP on the first boss" <-something like this.
I think the raid is well done for the current state of the game, but the sad part is that there's no build diversity or the raid doesn't require your squad to be diverse.
I remember in division 1 when the first incursion was released we had to try every possible skill combos to beat it, but now there's not much...revive hive and heal...
We dont have support,tank, technician, healer roles which is sad.

My overall opinion about the raid is really good!

I wish i had friends who play this game and be able to experience the whole raid.