Credit where credit's due, Peter Jackson did some pretty damned impressive stuff with
the LotR movies, not the least being getting them made at all. Unfortunately, for people
like me (who've read the series covers-to-covers many times, and actually have a pretty
good understanding of what all those amazing CG battle-scenes and such were about in
the context of the story), many of his alterations to the story simply make no sense...
For example:
1) Tom Bombadil - great character, but cutting him out saved probably half an hour of film,
and cost very little story-line. [Good change

]
2) Arwen, Liv Tyler's character, was little more than a trophy in the books, a prize for Aragorn
if he fulfills his "destiny".... but by merging that (small but important) character with those of
her brothers, Jackson cleaned up the flow, and updated a rather male-chauvinistic aspect of
Tolkien's narrative, without dramatically altering the story. [Good change

]
3) He moved an army from one battle (where it had a reson to be fighting) to another, where
there was not any justification... for no apparent reason... and he reduced Gimli, a prominent
dramatic character, to comic relief. [WTF changes

]
I hadn't heard about Galadriel appearing, which would be utterly inexplicable both in-story (since
she doesn't appear anywhere in the book, even by reference), or in production (hey, let's add
Cate Blanchett to the payroll!)...
Oh, and also:
BALROG!

See, I told you he got a few things right...