Not a rip off. But similar. I've played Mass Effect 1 and when comparing both Vigil & Librarian Scenes, the Librarian scene felt more interesting and original rather than the Vigil scene using random images explaining the Protheans & Reapers. The downfall of the Librarian scene, as another GAFfer pointed out, was that 343 tried to explain the Forerunner Trilogy into that one scene.
I think the Librarian scene is very nonconcrete and messy.
While I like bits of the unreal nature of it (the representation of humanity running mainly), I don't think it works. At all.
The Vigil scene is a lot more straight forward and easy to follow, especially because it fits into the overall narrative of the first game a lot better.
It's more of a "A-ha, so this is what happened" moment to Halo 4's "Wait, what?!?".
Edit:
It's been years since I've seen the Vigil scene, but I didn't have a problem with it at the time, I remember loving that last third of Mass Effect (1).
Going to watch it again on YouTube to see how it holds up.