The warband was written for normal Mordheim campaigns. Actually I have never played the warband myself until recently - only against
. There are two other dudes in my group one of which has always played them. So the band was always fighting against Reiklanders, Skaven, Undead, etc. I wrote it for a friend who was playing Chaos Warriors in Warhammer and he missed a Mordheim equivalent. So I was always facing them instead of getting a chance to abuse them.
Also note that Tom (the editor of the Letters of the Damned ezine - yeah, one more Tom) does playtest the warbands that make it into the ezine so you should feel comfortable in general when considering warband/hired sword rules from it.
I did get feedback from people all over the world who tried the list and no one had any problems yet. However, if you do encounter serious problems with it (which are not due to sheer luck and idiocy of your opponents), I'd be more than happy to hear about it and improve the list. Anyway, the list exists for about 3 years now, going through many changes over time, and I do feel comfortable saying that it is a well-written list.
I hope this does give you a good feeling about trying the warband. And I'd love to see some painted marauders, shamans and condemned!!