It's a game about hijacking a helicopter, flying up to a thousand feet, parachuting out, and then using your grappling hook to latch onto a fighter jet so you can hijack it. There's also a story, I think, but who cares?
Blowin' stuff up and causing chaos = Yeah
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The blowing stuff up parts look fun, but overall it doesn't look like the kind of thing that would hold my interest, just like Mercenaries, etc.
Also, I don't remember ever hearing about a first Just Cause, but I'm sure it existed... *looks it up* Yup, 2006. Huh.
It's one of the funnest games I've played in a while.