If it's crap ... We'll tell you
Red vs Blue is amazing. But, like any other form of storytelling medium it really just depends on the quality of the writing and the voice acting. I've seen a few other ones that had good writing, but it really sounded like the actors were just reading from the script. So yeah, it's all about who is doing it and not so much what they're doing it with.
I just had to post this, becausr this may be the funniest and most random gmod machinima ever.