There are a few moments in AC2 that tie back to AC1, which made me glad that I played it first. Actually, AC1 still hooked me- but that might have had more to do with it preying on my low-level OCD (must... collect... everything...) than anything else. I was just thinking the other day that I think it would be nigh impossible to play/enjoy AC1 after seeing all of the improvements in AC2... And I, knowing its shortcommings, didn't regularly recommend AC1 anyways.
005: You spoiled the surprise! But it's one of my favourite moments.
EDIT: Well you didn't ruin C3PX's surprise. But, still...