Scarlett Johansson is Black Widow in Iron Man 2

Well it would seem the rumors are true as today the world is a buzz with confirmation that Scarlett Johansson will replace Emily Blunt as Black Widow in the upcoming Iron Man movie and will also be signed on to play the role in other upcoming films related to the Iron Man verse. I have to say this has to really suck for Emily Blunt and I feel kinda let down since I am a big fan of Emily and think she would have rocked in the role.

Nicky at DeadLineHollywood says that Scarlett Johansson did try out for the role but lost to Emily Blunt. Who do you think would or can do the better job as Black Widow between the two?