Starting to see some reviews on the Droid 4. Still have my original motorola droid. Any opinions on the differences? I hear the screen, camera, and battery isnt that great on the Droid 4 but thats comparitive to the droid 3. My model is a couple years earlier then even the droid 3. I want to get an idea on how those 3 categories compare to my phone. Would definitely like to hear some thoughts, especially if you own the Droid 4.