This was one of the first games that all the stuff like sinks and loos and lightswitches worked in
Yep, loved the level in interactivity in it, even though 90% of the interactable objects had no impact on the gameplay, but its little things like that, that help immerse the player into the world imo, which was one of the things good ol' Duke was king at for its time.
Regarding the original Sin, I was surprised how damn long the thing was, just kept blasting through levels with that "the end level must be just around the corner..." just to find there was still quite a bit more hours of playing.
The price-tag was quite cheap too, even though considering the 1st episode is 6-8 some hours of length I recall reading? Well, that's more hours then I normally get from most $60 games of today. I quite like the episode thing when put into the context that the product *will* be finished at one point, and not abandoned half-way through the episodic release of the product.