Not sure if you mean the "middle ground" of Warfighter scores, since I still haven't looked at any other sites' reviews, but it certainly is the middle ground on our scale.
I did vacillate between 2 and 3 on that game, but ultimately the score was the product of the same editorial rigor we apply to all our reviews, which just involves having all the other guys read the text for logical consistency both within the review itself and also against the potential numerical score. Once any potential pizza deliveries are factored in, we reach a consensus.
Having reviewed games for many years where you arrived at a score by plugging several numbers into a spreadsheet, I've found the five-point scale to be especially liberating because it lets you use a rubric that simply amounts to "how much did I like this game?" or "how good do I think this game is?" Is it great, good, just OK, bad, or awful? Warfighter isn't flat-out bad -- I had a decent time with the multiplayer, as noted -- and didn't leave me with the intensely negative feelings of, say, RE6. Furthermore, the score isn't necessarily the right place to make a statement about EA riding the modern-military bandwagon; that's what the text is for. Nobody likes an activist reviewer, right?