^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.