User blog comment:Pepoluan/ME2 OST/@comment-730941-20100930104923/@comment-3088707-20101001031333

I can't blame the composers. After all, the tone of ME2 is so different from ME1. In ME1, we're still exploring the unknown universe of Mass Effect, which is why it is marked with wonder and discovery.

In ME2, it's a war against the collectors, the dramatic turn-around of situation (instead of being supported by the Alliance, Shep is now supported by Cerberus, which had been a former enemy in ME1, and so forth).