Finished this and Vendetta over the last 4 days. Liked them quite a bit, and am looking forward to the sequels.
It strikes me, however, that this universe would be an excellent place to open up for other posters to try their hand, similar to how Flint did with his Ring of Fire 'verse. I could easily see two anthologies arising from something like this: MHI: Auditions and MHI: Missions. (Auditions would be short stories about how various low visibility people got hired by MHI, and Missions. . . well exactly what it sounds like.) Thoughts?
As for the novels, They were pretty good. I did wince a bit in the first novel when you described "slamming in a new magazine" into the abominator. OTOH in vendetta you mentioned rocking them in, so it's all good. The biggest criticism I have, however, is the use of coincidence and unoriginal characters. I don't mind the protagonist at all, but some of the minor characters are a bit iffy. Brushing up against famous and historical figures is fun, but so very very overused that it gets VERY cliche. Frank's origin, for example, felt quite sophomoric, as did the aquisition of the warding stone. (Trying not to drop spoilers, so bear with me!)
IMO, this is one of the things that makes Heinlein's latter works less enjoyable, as he bends probability like taffy. Likewise, much of Ringo's work uses too much of "The Ultimate *" in whatever field. Now, you're nowhere near as bad as either example, but I see a bit of trending in that direction. Having approachable characters, with believable backstories is much more enjoyable for me than having the world's ultimate badass who not only designs his own gear, but leads the charge into battle and survives a point blank nuking. (especially when a little bit more thought into how he had set up the invasion would result in a solution that completely defuses the posleen threat. . . )
OTOH I loved the "Fan service" The referance to BunBun, l33tspeak and hackertalk, the gun-terms, etc. Though no Veteran of the Psychic Wars being played. . .