No it is not but the chances of getting a stamp is higher or at least it use to me.
I remember going through the same thing few years back but then economy was not as bad it is today. Always remember the guy's job at US Embassies is to stop people from coming or act like a gate keeper.
Just carry all your supporting documents like:
- Tax returns
- Offer letter
- Letter from the company stating your continuous employment
- Pay stubs
- Bank statemen
ts and any assets you might have in the US (property, etc.)
Good luck