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Lord Marrowgar is on the PTR tonight, and he's already been downed by a number of groups and guilds. Remember, however, that this is the test realm so there's a good chance the boss is undertuned and will be a bit harder come WoW patch 3.3. Or not, Lord Marrowgar (who has less health than someone like Lord Jaraxxus) may just end up being a 'gimme' boss to ease you into progression. Either way, don't read too much into his difficulty tonight.
Even of he's not perfectly tuned yet, the testing has given us some idea of how his fight will go. His notable abilities are...
The fight (which is basically a Black Temple flashback) is mostly keep the tanks alive, move out of the Whirlwind, don't get impaled, and then loot the boss. Considering there will need to be two or three tanks in front of him at all times, it's very likely this boss will not parry haste. Parry hasting or not, I suspect this will be the gear check gate of Icecrown Citadel. If your three tanks can weather the Saber Lash, you're ready to do Icecrown. If they can't, you need to take a step back and farm the Coliseum a little more. This could be another reason why we're seeing a lot of kills on the PTR. Premades decked out in Best in Slot gear.
The achievement specific to Lord Marrowgar is Unboned, and he's also one of the bosses necessary for Storming the Citadel.