I like to mod Dark Messiah because it's almost perfect. Combine it with Trespasser and you have sim-like levels of immersion that have yet to be matched. It's odd that developers didn't just take those 2 physics engines and improve upon them, rather than restarting every time...
A new, challenging way to play Dark Messiah: -7 Classes -9 Action Sequences Faster, more intense, more immersive, more difficult, class-based gameplay.
Dark Messiah Reborn is a revamp/rebalance mod that makes the game feel more immersive.