^That's debatable. I mean at least it was something new to fight and actually expanded our understanding of the reapers a little (whether that was something worth knowing is neither here nor there.) The ME1 end boss was just a reskinned geth hopper chucked into an enclosed space.
The problem with the human reaper was that it changed the overall tone of Mass Effect into a more condensed and quite honestly, contrived storyline that slowly got worse. It essentially all boiled down to "Humans are special" and that we are the Reapers #1 threat and target. I hate it when we have an entire universe full of diverse aliens with their own unique strengths and weaknesses that the franchise all of a sudden resorts to having humans be the cream of the crop. This is why I like the first Mass Effect game over 2 and 3 because it didn't portray humanity like that. Humanity wasn't the center of the galaxy, they were, like everyone else
, just a part of it. Shepard isn't awesome because (S)he's human. (S)he's just the hero who happens to be human. I don't see why an Asari, Turian or even a Krogan couldn't accomplish what Shepard set out to do.
Dude, did you not read the Codex entries relating to the System Alliance's rise to power? Humanity went from "we're stuck in our solar system" to "up and coming galactic power" in the span of decades
. Hell, the volus and hanar (or was it elcor) are pissed in ME1 because humans either got an embassy on the Citadel quickly, might be made Council members before they are, or both. Humanity being special has always been part of Mass Effect.