It all depends on your interests whether you should stop there or not. Do you have a guidebook with information about Dresden to see if it has sites that you want to see?
I enjoyed myself in Dresden a lot, though I only had 1 day to really spend there and it was raining the whole time. Kind of put a damper on things. The Green Vault was breath taking, I liked visiting both of the inner city churches, and I got a kick out of walking through the underground wall fortifications.
No one can tell you if there are place of interest for you between Prague and Berlin because we don't know what you like. History (ancient, medieval, modern), museums, scenery, music, castles, markets, shopping?