Actually the movie series this spawned is anything but serious! And you should not take it as such. I bought the Blu Ray box set from the UK and so far have seen the first three movies. Even I had forgotten how rough, down and dirty the movies were back then. While the blood is super fake mostly (the red you may be used from Giallos and other movies), it is meant to be over the top! The amount of blood that is squirting at times (especially towards the end) is just ridiculous. But again, this is not meant to be taken as anything else as entertainment.
Now of course times were different and all that. The movie does not take any prisoners and while delightfully short (around 80- 90 minutes each one of the movies I've seen), it always takes time for what some would call "mundane" scenes. Or scenes that do not further the story (paperthin as it is) or do much. The first movie has a weird scene that brings the cub of the (english) title in a peculiar situation ... rent-a-baby! Which does not even explain half of what happens almost right at the beginning.
If you are easily offended, do not watch this. If you are a "PC-Warrior", self proclaimed or not, do not watch this, if you can't watch this without thinking of all the nudity, the misstreatment (especially of women, including rape and attempts), without remembering this is just a movie that was meant to entertain, not educate, do not watch this. Otherwise go ahead and make your day