My eyesight is fantastic, I can read a road-side sign with interchangeable letters from over a football field away. My hearing goes in and out.
On my 31" low-end HDTV (420p), the font/subtitles size for DA:O was absolutely perfect. It was easy to read, and didn't take away from the action at all.
For DA2, it was barely legible. It wasn't really at all on my 32" SDTV. There was a significant difference. I would have infinitely preferred DAO sized text. ME1 was just fine with text size so it had nothing to do with the dialog wheel.
For DAI, this is absolutely pathetic. Why the hell don't you make SD fonts at all? Let people choose between HD and SD fonts. Some of us actually want to read what's going on while sitting on our couch. THAT IS ALL I ASK FOR ANY BLOODY GAME. It should be so simple to implement. Oh well, fudge people without at least a 42" 1080p HDTV. Anyone with less doesn't matter.