I'm trying to be optimistic here . An engine built from scratch is good because it means they won't have to compromise on the features they want. Another plus is that they already had a test run with the earlier versions of the frostbite engine. Re-writing it from scratch, specifically for BF3 with PC as lead platform is only going to lead to good things. IIRC, they started work on BF3 not too long after BF2 was released(2006/2007). Since they wouldn't have even had an engine at this point, it gives me hope that the base concept and gameplay of BF3 will stay true to the BF series as development started before the Call of Duty got big enough to influence every game and saturate the FPS market with what we have today. Plus, I have yet to be disappointed with a Battlefield game in the PC series.