Ok, as the title says only for noobs, because almost everyone by now already knows how to beat him easily. I know you can find guides everywhere about this but decided to make my own with 2 different perspectives.
This is the middle strategy that most of us use. First touch the Crystal, to trigger the encounter, clear the rooms, leave the Knights low on health so any hunter or warlock can create orbs with their super because with orbs and the correct equipment is the only way you can regen health.
After clearing the rooms, go outside all at the same time and stand in the middle platform, waste no time in killing swordbearer, see my point of view as a hunter swordbearer: https://www.youtube.com/watch?v=31rnYAfXkcE. As you can see the swordbearer should go for the sword before swordbearer dies to ensure correct timing, as soon as swordbearer is killed, have a titan pop a bubble with blessing on the right side where Crota goes, see my point of view as titan: https://www.youtube.com/watch?v=Dx0Ms7lv1Tc. This will get Crota's and the boomer's attention so the swordbearer will be safe, be sure to have their attention and stay inside the bubble, you can still throw rockets like I do.
You can see the rest at the video, for Ogres go to the right room where they spawn and pwn the first one, then safely kill the other one and careful on your way out, if Crota is on the side wait for him to go middle, side, then middle again, and if he is in the middle, wait for him to go to the side then back middle that's where you will go for the kill.
When he gets enraged, this is where many fireteams fail, IGNORE OVERSOUL, imagine there's no Oversoul and just focus on taking down Crota again. And most important, when in the middle on the outside don't stay close to the crystal, stand as close as you can to the ledge because once Crota gets enraged there will be thralls behind you and can kill you and if they do, Crota will regen his shield and it's a wipe.
By doing is this way I've helped lots of teams, even teams with level 30's & 31's it's mainly a matter of doing your job and not dying, and the most it has took us is 3 tries. Sure there are more ways to do this but this is the one that I find the safest and easiest.
Hope this helps at least one person, anyone can do it, just practice the timing and work as a team.
Videos again:
As Hunter: https://www.youtube.com/watch?v=31rnYAfXkcE
As Titan: https://www.youtube.com/watch?v=Dx0Ms7lv1Tc
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Level 32 Elitist Gjallerhorn pricks, suck on this: http://youtu.be/jaaBRWHbUVQ