I thought the opening was excellent to be honest! I haven't played many games outside of GTA but recon I'll really like this one.
I liked how it set the story up and explained what was going on in the world at that time. The way you could look around and see what was going on made it real, and it was shot in a way that almost made me feel I was there with the protagonists. Very well done indeed!
Well, I think a quote from movie can describe it best...
Erik Lensherr: "What did you just do to me?"
Charles Xavier: "I accessed the brightest corner of your memory system. It was a very beautiful memory... thank you."
~X-Men: First Class
For me it was the best opening i ever saw, there's lots of games with flashy and epic opening, God of War 3 being one, but as good as most opening are, they rarely ever get to you emotionally, but this one even thought i knew what would happen to Sarah, still caught me by surprise.
Teary eyes were there, and god i felt sad, it was perfectly played, the look in her eyes as the light goes out.....