Well i live in corpus christi, about 30min from Port "A".
There is one time a year when its good, its around late august- early september.Its when "Blue Water" ,as we call it, comes in all the way up the jetties and the vis is about 50ft, and like rick said the currents are a real challenge.
I normally went out halfway down the south jetty by this large UTexas research pier, you can see some decent fish and invertebrates.
I normally only go when i need to try out new equipment or double check my gear before a dive trip.
If you go any other time in the year its like diving blind, i dont recommend it.
oh yea the large commercial traffic has picked up and its rather hairy when a fully loaded freighter comes by.
Mando