Well both games have speed up mods that make the monsters move at 200-1000% speed. These mods tend to be heavily recommended wherever/whenever the games are discussed.
Sliding the models or animating them at 600% plus speed, same thing really, either is fine with me, as long as they don't warp, that's a bit disorienting.
The alternative is literally hours and hours of watching zombies or bugs walk across the screen one at a time.
If you haven't already, I strongly recommend you try a few hours of POR2 without the speed patch (get to some of the fights with large amounts of undead), then install the speed patch and compare.
Or just watch this (turn down sound) starting at 1:07, then remember that you fight hundreds of these slow guys and sometimes they can aggro from really far away.
http://www.youtube.com/watch?v=hvYplvUXuEA
It's not such a bad game with the option for 600%+ speed animations at the press of a button, thanks to the fan produced speed hack. (still not a good game)
Additionally, there should have been simultaneous movement for all enemies who are acting at the same initiative, like TOEE had.
I'll go to my grave defending properly sped up turn based as the ideal, however when you consider POR2 and Wizardry 8 came out AFTER BG2 and were so unplayably slow unmodded, it's no wonder everyone preferred RTWP.