I would advice against doing Rragar's with H+H unless you're very experienced at running with them - just one other real player will make it much more enjoyable when you have 6 heroes to configure. Minions are not particularly effective since fleshreavers tear through them like wet paper, they fail to bodyblock shadowstepping charrs, and the only source of reinforcements in the final fight will be your own team, and considering that the dynamic duo in their batcave spells an instadeath to any squishy who's not hiding behind a big rock there won't be a lack of minion material but that is not as happy a circumstance as one might think
I consider dual para almost a must, if one of them is a real player all the better. A reliable source of daze is necessary as well, considering fleshreaver rits and Rragar himself. If you have trouble staying alive during the final fight, consider bringing several copies of Vengeance. You'll get infinite lives (no DP) and energy, 25% damage bonus and your minion master behind that rock can animate an endless stream of minions (that's an unconventional idea that has been tested to work well against some nasty end bosses).
If you have a decent vanguard rank take some PvE skills with you. The standards are good, and the assassin summon is a pretty nifty decoy. That's another good reason to have several real players in the team as everybody can bring 1 or 2 vanguard skills that benefit the entire party.
Edit: darn, Jaceb beat me to it again
