My Initial impressions are positive. I noticed three things: extensive use of fire (suppression?), more purposeful movement and use of high rates of fire in single shot mode.
After a second round with this, I have to say I am starting to warm up to it. The AI is certainly brutal, but looking at what we did I think the outcome was deserved and realistic. I do think we need to rethink our strategy, since most of it will not work anymore, but that is IMO a good thing.