FWIW, the CoT policy on Voice work is "If you can't do it right, you shouldn't try" and we're choosing not to risk it. Superhero dialog teeters VERY corny making it difficult to pull off straight even by frontline talent. If we had a more universal theme, like, say Freedom Force, it's a lot easier.
This actually really saddens me. First, because with my set up reading long boxes of text becomes a bit tedious and takes me OUT of the game world, but more importantly...
To me it's a sign of a game that will already feel "dated" by design in ways new players might find unpalatable. I work with teenagers and can tell you that this younger generation sees games where all dialogue is text based as outdated to the point of being "quaint." It seems rather like the mindset Nintendo took with HD graphics and Dialogue in the last generation console wars, and we see how that turned out. At least the 200 or so of us who have a Wii U do. Not keeping up with the direction of the medium REALLY hurt Nintendo badly. To the point that they may never recover, even after releasing and entirely new console to try and make up the losses.
Of course, as someone with an extensive background in writing, I wholeheartedly disagree with your comments on super hero dialogue. Have you ever watched ANY of the current Marvel Universe cartoons on Disney? Or any of the JLU series? The reason that dialogue is "good" while the 1980 Superfriends dialogue is "bad" has nothing to do with the medium itself, it has to do with expectations.
Good dialogue is good dialogue. Bad dialogue is bad dialogue. If you're writing "corny" dialogue that's not because of the genre, it's because of bad writing or because the assumption is that somehow it "should" be corny. That was the expectation in the 60s, 70s, and 80s for Super Heroes, both in style, story line, and dialogue. They were campy and over the top. It isn't the expectation any more, and unless you want to pull a Champions Online, which pursued that antiquated view of Super heroes to its detriment, then your writing shouldn't have any dialogue bordering on "corny", so it shouldn't need Morgan Freeman to pull off.
Just my 2 cents.