Jim Belushi -- Sorry, Emile Hirsch ... You're No John Belushi

Emile Hirsch is a crappy choice to play John Belushi in the recently announced biopic -- at least according to Belushi's brother ... who gave us his fully biased opinion on who should get the gig.

Jim Belushi was at LAX when he told us he likes Emile as an actor -- just not as an actor playing the late great Belushi ... and instead thought Robert Belushi should play him.

Of course, RB is Jim's son ... so it's hardly an objective choice on his part -- but he does offer a couple of good reasons why 33-year-old Robert could do it, including the whole blood line thing.