I should go back and watch again, I've seen enough clips on YouTube to convince me it's worth a repeat viewing. But on first run through, it seemed not as good as BoB (which was the consensus opinion of critics) only because it wasn't focusing on a single set of characters, but rather three main characters. Overall though it seemed faithful to the source material and did a creditable job of describing life in the Pacific as Marines and GIs at the time would have experienced it.
Grant seems like an odd comparison - I liked it a lot, but it was really a documentary rather than a mini-series.
But now that you mention it, both Grant and BoB had some very moving scenes. The German general saying goodbye to his men, and the last montage of Easy Company at the end of it were very emotional. Hearing about Grant's leniency to the Confederates at Appomattox and hearing how it was probably due to Grant's many experiences of failure, I also found very moving. I don't recall being moved anywhere nearly as much by anything in the Pacific. The postwar hunting trip maybe, but for me it didn't really compare.