The only way I've seen games use is when they show only a bit of dialogue in a box at a time, and you have to click 'more' to see more.
Problem is, that doesn't work with real-time spoken dialogue very well, as it loses the flow/continuity. I suppose you could have the vocal sounds and the written verbage pause at the same time, then continue when you press 'more', but unfortunately the average gamer would probably find that more distasteful than not being able to read at first glance.
I can understand the frustration tho. My husband is a very slow reader (he's a bit dyslexic or something similar) and that's one reason certain types of games (and subtitled movies, heheh) do not appeal to him.