because everything I've seen about Just Cause 2 so far looks amazing
Exactly my opinion when I was watching gameplay videos.
The shooting aspect just felt bland as, which is something that needs to be good in an action game. Who knows, maybe if I play the demo a bit more it'll grow on me.
I highly doubt it though.
EDIT:
I may have just proven myself wrong. Played for about half an hour, and it began to warm on me. BUT the only way this could hold up as a good game would be a really good story with good calibre voice acting (sadly one thing that doesn't sound like it was a focus).