That can be chalked up to bad writing, not just the voice acting. I'd point to GLaDOS, Wheatley, and Cave Johnson as examples of voice acting being important to help the dialogue. The writing in and of itself is funny, but the performers bring so much personality to their characters through voice acting that the lines become much more memorable.
Also, the voice acting is only part of the problem that the article points out. Another aspect is the very limited animations of the NPCs which stilt the drama too.
As for a "real dialog," I'm not sure what you're looking for. If you're looking for a game that allows you to realistically have you carry dynamic conversations with the NPCs, yeah, we're never going to get that.