Mark - all I can tell you is that, overall, the AI does a good job, if not a realistic one per se.
I'm only in 1940 with GWX, and the escorts are still a bit on the dumb side. They spot you fast, either on the surface or submerged. They are not too good at dropping the cans on you though. ASDIC seems a rarity still, which is appropriate I think.
I think the stock SHIII AI's biggest problem is that, using just passive equipment, it is able to spot subs at great lengths. Surprise is only possible it seems if you position yourself at a standstill some distance to the side of a convoy, or if you have terrible weather.
I uninstalled SHIII last year without ever getting later in the war (I think 1941-42 was as far as I got), because of Starforce. Later in the war, say post mid-42, I should historically have one chance in 5 of surviving a depth charge attack with multiple DD's. Now the odds seem to be well in my favor unless I'm caught in shallow water.
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Crimguy
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