I've always loved the physics/mechanics of 1.6. I've only noticed truly "bad reg" when I moved to Source for TD.
This game (Source) has HORRID hitbox/registry/physics/mechanics - call it whatever you wanna call it, but when you deagle shoot a metre left of a guy's head and it's a headshot - there's problems.
But eitherway, I don't want to play a game that kids "magically reverse code-engineered" (laugh, valient effort). Like I said before, they're just re-making the original mod using their own shit, big hoo hoo. It'll still have the same problems this game has.
And I'd much rather play the ORIGINAL (and legit) game with problems than some custom gay shit with problems.