The problem doesn't really lie with developers, it's console manufacturers - there just isn't enough standardisation.
Most fonts in videogames are bitmapped, compared to your OS, with it's truetype, smooth screen fonts. See a truetype font like you see on this webpage is made from vectors, so the font can be scaled to any size without loss of quality, it will always look right, and remain legible even at pretty small sizes. The smoothing, or anti-aliasing is better, because it's based on vector data being rendered onto bitmap data.
Now, if you have a bitmap font, it's at a set size, when it's scaled, all hell breaks loose. If you scale a bitmap font to a higher resolution it looks blurred, if you scale a bitmap font to a lower resolution it looks blocky. You can't win, all you can do is set the font size to a standard, don't scale it, in fact if you scale it your better off having different sized bitmap fonts = lots of resources taken up.
Take the iPad for example. Someone might make an iOS game that runs on both iPhone and iPad, but that's not easy because scaling will make one or both of the versions look worse. You take a 480x320 display and update it to 960x640, fair enough. Then add in the iPad res of 1024x768. That's a scaling factor of 2.0, then 2.13333333333. Scale a bitmap font by 2.1333333 and its starting to look pretty shitty already. The general solution? - make the font ideal for iPad, then it'll look shit on the iPhone... developers can't win. The more complex and fancy and pretty the UI has to be, the less power the developers have to customize it for each different device.
So what is the ideal solution?
Truetype font support across every gaming format, a standard - a flexible font system that looks good no matter what the resolution, because it's being anti-aliased on a native resolution. It might mean less pizzazz on screen fonts, but legibility is the important factor. Not that it matters, it'll never happen - developers are stuck with bitmap fonts because console manufacturers might not necesserily want older games to look too nice on new hardware. This is gamings era of cross platform gaming - developers have driven that, not console manufacturers... they tend to only care about their own platforms, and really Apple doesn't even have to care about these things, people buy their hardware anyway.