I've created a generic team that all have conservative or precise mentalities with 100 for defensive and 10 for attacking, highish ratings for drives, glances and sweeps and low for cuts, pulls and special shots, along with low strength; each player is 60 for their overall rating. I'm currently 6 overs into a test match against them (I'm England) and they're 27-4. You'd think that having 100 for defensive and 10 for attacking would mean that they'd seldom play attacking shots (particularly with a conservative mentality), but I've already seen a fair few swings and the wickets that have fallen have been due to playing attacking shots (two LBW's for trying to pull a knee-hight ball, one bowled for trying to drive and completely missing it and one edging a drive to the keeper) - therefore it would seem that having a low attacking score doesn't necessarily mean they'll play less attacking shots, they'll simply be more prone to making mistakes (and getting out) when they do. Despite the several swings/unnecessary attacking shots, there have been numerous solid defensive shots and lots of drives, so it does seem fairly realistic, but the number of attacking shots played by the AI in tests does need to be toned down overall, particularly early on in the match/their individual innings.
