Already it's clear there are going to be some battles that emerge as classics in the game. On the first level, it's the big ending sequence the dam,
On mission two, it's the part that was owning me earlier today, a part I've mentioned as being awesome the first time through on Heroic:
the Brute pack in the barracks. <snip>
I tried - and failed - to get past them earlier, after ~10 attempts, but I'm having a hoot getting owned by these guys.
I'll be happy to share out the video of me being owned hard-core over and over should anyone be interested. It's probably more exciting to experience than to watch.