I'm not quite convinced all these actors wanted to do this. I think its bread and butter stuff, despite video games making much more money than movies. I saw Clease looking at his watch.
That's the feeling I got as well, which sucks because I love John Cleese. :[ But yeah, it looked like he was just doing it to get paid, the watch glance kind of gave that away. Plus he just all-around didn't seem very enthusiastic, and his line-readings were kinda boring and uninspired.
Also, the guy from Spiderman thought his character was such a rich and interesting guy with so much inner turmoil, yet couldn't remember the line that captured the essence of this character. It's like a bad answer to the interview question "Tell me why you want to work for this company?".
I understand their apathy. It's the same reason why movie actors go back to stage acting:
In a theatre you have an actual audience and other actors who are acting
right now, and you can't screw it up. Oh my! Then the after show party! Woo!
In movies there's you in a green suit with some white bobbles on it, and maybe a stand-in reading lines back to you from behind the camera, but that's OK cos at least you get to walk around and meet a few of the cast for the big scenes. Scenes might have to be recorded many times, but that's OK because the director might let you throw a few "interpretations" in. The catering is probably OK too.
In video game voice over, there's you in a dark recording studio, a script and a recording technician in a room next door. You will spend whole days reading variations of "Hmm, this door is locked from the other side". Bring your own sandwiches.