But even putting Deathly Hallows aside, it's bizarre that the world's most popular film franchise couldn't win a single award in the U.S.'s biggest popularity contest throughout the entire span of the series but Shrek can?
Looking at it, I see the HP movies on the low end of average, but not the very bottom, out of the top grossing movies.
And it looks to me like Pirates of the Caribbean is more popular but about equally poorly represented at the Oscars (with one win, but fewer nominations).
Worldwide highest-grossing films
1 Avatar $2,782,275,172 2009
3 Oscars, 9 Nominations2 Titanic $1,843,201,268 1997
11 Oscars, 14 Nominations3 Harry Potter and the Deathly Hallows – Part 2 $1,328,111,219 2011
0 Oscars, 3 Nominations4 Transformers: Dark of the Moon $1,123,746,996 2011
0 Oscars, 3 Nominations5 The Lord of the Rings: The Return of the King $1,119,929,521 2003
11 Oscars, 11 Nominations6 Pirates of the Caribbean: Dead Man's Chest $1,066,179,725 2006
1 Oscar, 4 Nominations7 Toy Story 3 $1,063,171,911 2010
2 Oscars, 5 Nominations8 Pirates of the Caribbean: On Stranger Tides $1,043,871,802 2011
0 Oscars, 0 Nominations9 Alice in Wonderland $1,024,299,904 2010
2 Oscars, 3 Nominations10 Star Wars Episode I: The Phantom Menace $1,010,898,386 1999
0 Oscars, 3 Nominations11 The Dark Knight $1,001,921,825 2008
2 Oscars, 8 Nominations12 Harry Potter and the Philosopher's Stone $974,755,371 2001
0 Oscars, 3 Nominations13 Pirates of the Caribbean: At World's End $963,420,425 2007
0 Oscars, 2 Nominations14 Harry Potter and the Deathly Hallows – Part 1 $956,399,711 2010
0 Oscars, 2 Nominations15 The Lion King $951,583,777 1994
2 Oscars, 4 Nominations