I've not played a lot of Hexen, Raven's sequel to Heretic, but I kinda got bored of it rather quick. Oh, sure, it does introduce several new options, such as picking one of three character classes.
Doors swing back when they open.
You can shatter the stain-glass windows. And the Hexen engine is slow, even on relatively fast machines. There's not much more to say. Basically this is a game with little in the way of useful innovations. Which is not to say that it's a bad game, nor that it lacks in good graphics, but I just couldn't get into it.