Pretty cartoonish.
There's a lot of "pretty little head shots" in this movie http://tvtropes.org/pmwiki/pmwiki.php/Main/PrettyLittleHeadshots.
I would have thought that Cimino would have been above this, especially since he pulled off the violence at least semi-realistically in The Deer Hunter.
Limit of the Willing Suspension of Disbelief: directly proportional to its awesomeness.