Whedon does not get a pass for this. I had to search for this, he commented that the movies script was mostly intact but the direction was bad. Then he commented the casting was bad later. Everything was bad except his script.
Don’t get me wrong, the direction is extra bad and there are bits where you could see the writers intent vs what we got, but its bad. A tone correction to pronouncing fork would not have fixed this mess. I don’t think this would have been a Serenity, and I don’t think jokes about Walmart show any appreciation for the setting. Whedon is not one to take blame though, clearly.
It is amazing how many recognizable faces are in this and yet how squandered it all is. Whedon complained about typcasting but I think actors who know how to play a type is a small issue in the grand scheme. Winona Ryder is the only one who seems to struggle a bit, with any other issues being down to directors interpretation of scenes. That direction will definitely be noticeable though, as at the time the director did not speak english and I believe this is why jokes are often said loudly or seriously.
There are just far too many nonsense things that happen and make no sense. Also, basketball. In general though, it feels as though Whedon didn’t really get what came before. Established things are not taken seriously, like if a face-hugger gets on you all the way then you probably aren’t getting it off.
Being brave with a series isn’t the worst. A franchise like Scream has suffered from beating the same drum over and over again in my opinion. I think the idea of injecting more humor, as the script seemed to want to do, isn’t necessarily wrong. The first movie was horror, then action, then whatever the third was (worse action?), and this could have been a blend or some such. It needs to respect the foundations though, and it struggles to find any footing.