The first reactions to Joe Carnahan's Boss Level have arrived following a special screening of the action pic at Arclight Cinemas in Los Angeles on Tuesday night. The Collider screening was a big event, with fans and critics alike gathering in the L.A. theater to see what the director behind Smokin' Aces and The Grey had cooked up for them. Among the folks sharing their first reactions to Boss Level was The Walking Dead creator Robert Kirkman, who wrote the movie was "totally great" before remarking, "Nothing like seeing an insanely awesome movie completely cold." Meanwhile, Gizmodo/io9 …