The Mean Streak is unlike most Metric cruisers in many ways. This is one of them. Instead of a really smooth idle, the jugs tend to bounce a bit causing vibrations that will travel up the handlebars. As to if yours is too much, I can't really say. If the vibration is always there, there's likely an issue. She bounces at idle but smooths out very nicely as the RPMs climb.
Other than that, welcome to the Forums.
You'll have to post some pics of your new ride (mine are in the link below).