Even Broadcom's wired NICs have different generations that came from different acquisitions: Tigon3 (tg3) came from Alteon AceNIC, I forgot where NetExtreme 2 (bnx2) came from, and NetExteme E (bnxt) is an in-house effort that is somewhat derived from the StrataXGS switches.
So yeah, Broadcom is a rollup of two dozen different companies so the quality of one product tells you nothing about others.
