I saw so stupidly many players in the Beta fail at Devil Walker in Devil's Lair - either die multiple times or took ages to kill - because they were together. So then there was just 2 targets for the tank, and I had to juggle positions at lot because the other 2 were, naturally, hiding in the ruined building on the right of the tank... the worst place ever to be in.
On topic: I'd say it depends a lot on how the raid really plays out. Personally, I don't even want to know what's in there before I go in the first time. If we fail a lot during an encounter, I could see myself coming onto the forums to discuss different approaches to that specific encounter without spoiling the rest of the raid for me.
I actually hope there are no "simple tactics" to the encounters in the raids of Destiny - so you can't just know exactly to rotate the boss clockwise to avoid that flamethrower thing it does, but you have to have a keen eye and adapt to the situation - if the flamethrower splits into two smaller streams and circles in both directions but can be jumped over / ducked under, act fast!