The only reason I ragged on the Librarian scene being similar to the Vigil scene last night was because the Librarian scene was poorly done. For the most part, the scenes happen very similarly. Chief and Cortana talk about how they might be led to a trap, Shepard's crew say the same thing. Chief stopped, light bridge reveals path for him to follow. Shepard stopped by force fields that force him down specific path. Both meet with the ancient ai that speaks of their meetings as a result of an eventuality they had accounted for. Reveals the tools to be used and further secrets of their great enemies. Also reveals the key to defeating them. When I was play Mass Effect last night it just screamed rip off to me. If you're going to mimic something, do it well. If 343 successfully pulled in awesome features from other franchises and executed on them well with their own twists,I'd dig. But they have not really done a good job of making it work within the context of Halo just yet.