I agree, it does seem very specialized.  But I really like it, buzzsaws are psychologically scary.  I would just retool its buzzsaw system to be a hidden weapon that he pulls out when they are needed, but he still has an arsenal of regular weapons--your bread and butter.  The buzzsaw (and variants of deploying them) could be a secret trump card that enemy Frames don't expect.  It's similar to how my pilot's Marauder reserves a pair of hidden piston-rams that come out after most of his weapons have been used up.

That's my two cents.