Hmm...I mean, Obadiah took what Tony had created, the puzzle was already complete when he simply added to it. I dunno, it's probably the comic book geek in me bleeding through but it isn't as if Obadiah is some layman, he's a cunning adversary; he's also no Tony Stark. No Stark, no Iron Monger. Granted, this wasn't easily conveyed in the movie, that Obadiah is a badass...he just looks like a businessman, but it isn't a stretch to say that the man behind the curtain of Stark Industries before Tony took control needed to be cunning and smart, and he certainly is.
I loved it, but I can see how it could seem careless. It's completely conceivable to me though. I think he's one of the better MCU villains despite him being used as a stepping stone (his full story is one of my favorites as well). But yeah, then IM2 (and for as much as I REALLY WANT to like IM3) screwed up the format with some...throwaway 3rd-string mofos as villains. I actually thought Whiplash was a cool concept but god damn it do I hate Rourke as an actor (well...till The Wrestler). That fucking accent, I wanted to tape his mouth shut the entire movie.