Descent Freespace intro is still so good that I'd show it even to my mother. And she doesn't even like intros!
Crysis 2 intro is otherwise quite pleasant, but towards the end of it it is too much of "yeah look how badass I am, I single-handedly destroy helicopters and tanks by merely farting at their general direction". And that last zoom to his skiing goggles, come on, cliche much? Oooh, me so scared!
I would have liked the Crysis 2 intro better if the protagonist had died a painful death at the end. After all, wasn't that exactly the start of the game, your predecessor died? Why didn't they show that in the intro?
Cool as it is, the Crysis 2 intro is a bit too much of the 80s Schwarzenegger/Stallone type intro.