Movies are the sum of many parts; music, costuming, writing, art direction, cinematography, sound design, location scouting/set construction, physical performance, fight choreography, stunts, special effects, editing. One or a few of those being bad don't condemn a movie. If you say CtB has shitty acting I don't agree(it's not good for sure) still I can accept that's your opinion and it's valid. But if you say CtB is a horrible piece of crap solely or primarily because it has shitty acting my response is that you're a shallow twit.
Note how accuracy to source material isn't even on the movie parts list. Cause accuracy to source material doesn't matter one whit to the art and appreciation of movie making. It's a creation of academics and fans so they can show others how very knowlegable they are. I don't give a flying fuck if CtB portrays Conan the Cimmerian "correctly"(whoever gets to decide that? Oh, it's you, self-appointed fantard), follows the plot of any story written by Robert E. Howard, or even if it has the "spirit" or "style" of the Conan yarns. No ZOMG! his hair isn't black! Look it says right here on page one! "He ran his fingers through his streaming black mane" If I want Conan as R.E.H. envisioned him I go read R.E.H. It's completely fucking stupid to expect a different art form with the creative input of dozens to be an exact copy of what you perceive the source material to be.
I can't fathom how someone's opinion of a movie depends on its title and name of main character? If your argument against CtB depends on it being called "Conan the Barbarian" vs "Rogar the Barbarian", you're way too much of a pretentious anal fanboi. And I bet if it had been named the latter you'd be whining about how the writers of RtB ripped off Conan
Conan the Barbarian would be just another ok fantasy action flick except for Basil Poledouris. His blood pumping, soul stirring score elevates CtB to awesomehood. Battle of the Mounds fucking rules, I literally can't stay still and seated when I listen to it. Star Wars is another movie that wouldn't be nearly as great without its excellent score.
Regarding pulp fantasy: ancient snake-god, snake cult, orgy, cannibals complete with giant pot of body part ghoulash, black lotus, thievery, debauchery, brutal & bloody, few against many, fast-paced and action rich. How can you not see it?
Quit putting your expectations onto something and then bitching when it doesn't meet them. Enjoy things for what they are and in return get more enjoyment out of life.
Contemplate this on the Tree of Woe.