My batting tactics on all early ICC games in Tests and First Class matches are generally the same...batsmen start on 0 aggression when they first come in, move up to 1 when their settled rating reaches 2 bars, then 2 for aggression when the settled bar reaches 4, and so on until they move up to 4 for aggression when fully settled.
This usually works well, Saeed Anwar scored 4 or 5 hundreds in a test series v Australia with this method.
For tailenders (batsmen who average under 20) I start them on 0, move up to 1 when they are half settled, then 2 when fully settled.
As for bowling, my new tactics are 6 for aggression when a batsman first comes in, then down to 5 when his score reaches 5, then down to 4 when he reaches 15, then down to 3 when he reaches 30.
My new tactics involve NEVER changing line or length, I decided that my bowlers should just bowl a good line and length to be most effective (middle and off, normal length).
For pace bowlers I use the field with 4 players in the slips/gully region until a batsman's score reaches 10, then the balanced field with 2 slips and a man out in the deep point region after that. For spinners I use the balanced field with men out stopping boundaries, and a slip and 2 close catchers.
I put the bowling aggression up to 6, and bring in the field for pace bowlers, when a new day begins because the batsmen have to start their innings all over again with a settled rating of 0 when this happens, and I make a note of what their overnight score's were so I know when to change things.
In one day matches my bowling tactics are to use 2 for aggression until a batsman hits a boundary, then move down to 1 for the rest of his innings. I ALWAYS bowl outside off stump with the most defensive offside field.
For batting in limited overs matches I start my batsmen off on 3 for aggression, then move up by 1 for every 2 bars on their settled rating, until I reach 7. This usually results in a good score (240 to 280, sometimes 300) and very few collapses. I move up to 8 for aggression in the "slog" overs. I invented a formula for deciding when to hit out, it is...(Wickets in Hand x 2) - 2...for example, if I have 5 wickets in hand I will start slogging with 8 overs to go (5x2=10....10-2=8).
These tactics work for me, though I do lose sometimes.
Those tactics are almost set in stone now, so boring and predictable that you could program the AI to play for me so I don't have to sit there getting RSI clicking the mouse button. Bowling changes and team selections are the interesting part of the game where a bit of guess work is required.
In matches between two human controlled teams I use different tactics, but I have found the above tactics to be the best and most logical when it comes to defeating the AI.
Not sure how they work in ICC 3 yet, my results on that game so far have been very mixed, choosing Pakistan as my team and then playing my favourite players instead of the most effective players doesn't help.