It sounds like this is mostly the crawlspace (many inspectors won't enter a crawlspace) and then a roof failure during a storm.
I mean, your situation sucks. But it mostly sucks because of the storm, not the inspector.
Now, if the inspector was in the crawlspace and inspected the ductwork and plumbing under there, obviously they missed things. But I bet they weren't down there at all, nor did they say they would be. Likewise, they aren't going to dump water all over the roof to see if it has leaks - they generally will just do a visual inspection to see if it looks ok. Did you pay extra to get a thermal scan of the house to detect leaks/rotting wood?
To be more clear: inspectors *always* miss things. Their job is to find the problems they can and tell you about them. They're not in the business of guaranteeing any part of the house, and they aren't usually legally liable for things they don't find (this is usually clearly spelled out in the inspection contract). They are often worthless, especially for folks who are relatively capable/handy and perceptive.
To sum up: I wouldn't bother. It's a few hundred bucks. You got a crappy house, but most of the blame IMO is on you (outside of the act-of-god storm) not the inspector. More details could change my mind on the blame situation, but it's *still* not worth your time to get back $200 or whatever you paid. Consider it a lesson learned on doing your own due diligence.
_W