It could be close enough to a Nazi salute to make some people nervous. Having said that, it could also be a "mockery" of a Nazi salute perhaps. It doesn't bother me either way since it's only a game and does not promote any sort of Nazi agenda. :p
In fact, I get the impression that these guys (the game characters) aren't the Nazi types. In fact, the default character bears a very strong resemblance to the original G.I. Joe action figures that were popular in the 1970's. Probably why I like him.
Indiana Jones hates those guys (***) and that's good enough for me. Speaking of which, I never seen anyone get too bent about the Lego Indiana Jones games with their portrayal of *** as cute little toys that also saluted and performed "evil deeds" against other Lego characters and environments. :p