The voices were changed due to loud / persistent complaints by some, followed by more complaints from another group that preferred the original voices. The DK's voice gets better as the game progresses, and he doesn't talk that much after the beginning of the game, in any case.
The latest
patch is v1.45. There is no patch to change voices.
The 3D models also allow much more variety in equipment, which can also look different when worn by a character (ie not all large shields look exactly the same, a frequent complain in Divine Divinity).
How are you trying to target monsters? I didn't have any problems, except for ones which were moving fast (in which case I would pause to target them). You can hold the control key down to target the enemy closest to your mouse cursor.
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