I dunno, when I first heard about the bury/unbury tactic I thought it sounded pretty broken. A 5 SS model shouldn't be able to cheat death for an entire game just because the Dreamer has lots of bury/unbury in his armies.
That said, I've played with these guys without using that tactic in two games so far, and they haven't failed to earn their points back yet. I mean, each one can spam Gamble Your Life 4 times in a single turn, doing a minimum of 3 damage with every hit. Given that Wp 6 is as high or higher than most other models, I've found you're pretty guaranteed to inflict at least 6-9 damage on the opponent before they pop. Given that those damage values tend to drop all but the toughest models in the game, they're still fantastic.
Creepy Fog is nothing to shake a stick at either. There are plenty of nasty spells and ranged attacks that can kill the Dreamer, and 4" obscuring is enough to stop most dead in their tracks.