Still needs at least a +1 weapon to punch through some DR, but aside from that an army of followers seems to be pretty effective in taking on enemy armies of low-mid level. Heck, with that damage bonus you might be able to actually do at least some damage to some higher level characters.
Note that I used the basic description from Crystalkeep though, seeing as I don't have access to that particular Dragon Magazine at the moment. Since Crystalkeep has a few mistakes every now and then, I'd appreciate if someone with access to said Dragon Magazine could check if Crystalkeep isn't missing anything like a limit or something on the maximum possible bonus the feat grants.
~Bowen