Whether or not beasts in general are effective or not depends on two things: how expensive the beastmaster is, since now we have to take one and his index price is stupidly overcosted, and two how the rules for taking beasts work now. We know we need to take beastmasters to unlock beasts, but does he just unlock one unit? Do they fill up FA slots? Not sure, and assuming I use the new 3 patrol raiding force fast attack slots will fill up fast due to only 6 fa slots and the desire for reavers/scourges.
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The Night is Dark and Full of Terrors...