OK, disclaimer here: I'm running this on a 27" screen at 2560x1440
The color scheme of the forums isn't a problem for me, because I generally prefer light text on a black background for monitors (the opposite of books). So, white on black/dark grey is just fine for me. The font size might be a tad small (it looks like 10pt or so), but that's a personal preference. There's very little extraneous colors in the forums - I count 4 major colors: yellow for links, white for text, and dark grey/black for backgrounds. The User info is a dark gold/brown plus a light grey for text. That's pretty understated and certainly not an eyestrain.
As to the game - My major complaint is the over-use of Small Caps fonts. Small caps are decidedly inferior in legibility to normal upper and lower case in fonts. I'm OK with Small Caps being used for things like the big buttons (Govern/Technology/Ideology etc.), but they're significantly over-used as the "title" font for everything.
I'm also noticing that a Sans-Serif font was chosen. At medium and larger font sizes, San Serif is better looking than Serif, but the reverse is true in small sizes.
Personally, my recommendation is that any place where there's a Small Caps being used, replace that with a normal San Serif Upper/Lower case font. And stick to San Serif when the font size is 12pt or better, switching to a Serif Font when smaller. I'll post a picture below illustrating what I mean.
As to the actual font family, well, that's pretty much a matter of personal taste. I find the one currently used just fine.