He's had some rough patches, but he's a spectacular player, that's why.
http://www.chessgames.com/perl/chessgame?gid=1451858
http://www.chessgames.com/perl/chessgame?gid=1415429
http://www.chessgames.com/perl/chessgame?gid=1437581
http://www.chessgames.com/perl/chessgame?gid=1654443
http://www.chessgames.com/perl/chessgame?gid=1333033
I notice that with todays notable games, Aronian doesn't win that many of them and most of today's notable games involving him show him losing. Yet, how is he still number 2 in the world?