I know that a medieval font makes the game beautyfull and with a particoular atmosphere, but it's something hard reading it.

Most of the times a simply font make things more READABLE and the game atmosphere doesn't suffer of it

I think that a font something normal (less decoration) and i suggest more anti-aliased.
(i'm not english so probably i'm writing something wrong

)
I'm a graphic, a web-designer and i've studied page-layout for many years (about one or two

).. there is two ways to fix this visual problem for me
one is making the font less medieval and artistic (something like the one of this forum pixel-black and pixel-white)
the other one is add gradients to the fonts (pixel-black pixel-dark-gray pixel-grey ....)
I suggest making it simple anyway, and i wants to underline that reading something written in normal font is extremely better that having the same text written in a medieval way but completely unreadable...
Hoping I've made few mistakes..
Thanks for your attention
Nevil