The lack of the character's pattern recognition skills with levers is pretty bad. What's worse is repeatedly mixing stacks of potions and having them express amazement after each mixing produces a successful result.
You can turn comments off in the sound options, so I assume you would also be able to in DD2 if they use a similar comment system. An automatic/adaptive setting like you suggest would be nice. They could also have comments start being made much less often once you've triggered that type a certain number of times, and vary the comments ('I wonder what that did' becomes 'well, that should have opened a lock nearby' or 'whoever designed this place sure has a thing for levers').
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