So I unlocked the Javelin gun. Thing is loving beast.
It pretty much anything it hits.
Only way I've found to counter it sofar as a necromorph is by being small and fast. As a Pack you can easily dodge it at close to medium range. Although as a Pack you also have your weaknesses. The main one being the Pulse rifle, atleast in the beta, because it can tear up Packs at point blank. But any other range and the plasma cutter still forgets stuff up.