Being honest :
I'd rate your site 3/10.
It has an outdated theme which looks very much conventional. Buttons and logos don't add the much needed sparkle to the sites appearance.
The combination of black and green hurts the eyes. Try changing the color scheme and change the fonts, add some fun stuff. Don't keep it completely related to your topic, a visitor may get bored.
Put some image ads, smartly utilize the empty spaces and add some good graphics.