Oh, yes, don't get me wrong - I really love a lot of their additions (which tend to be well written and thus fun to read, too) ... and I picked up a lot of cool ideas which I've added to my own vision of the 41st millennium. For better or worse, the IP allows everyone to cherrypick what they like and discard the rest, which goes for readers just as much as it goes for the writers.
Let's just say I don't particularly like most of the cases where the fluff contradicts. Most of the time I simply brush it off as unnecessary deviations, but a few cases keep grinding my gears.
I fully agree on the personality thing, by the way. That should be a big trait/issue of such characters.
And yes @ Accurate. I misremembered on the Penetration, though, it has 9 as basis and gets a further +5 for a total of Pen 14 when used with Turbo Penetrators!