Alright, here I go.
Zelda - I never really enjoyed them since Ocarina. It has the same re-hashed gamplay in each sequel.
Ghost Recon- Some of the most boring games I have ever played.
Gears - I hated the multiplayer, however I did love the single player. Couldn't understand people's love for it.
Ninja Gaiden - I don't understand how or why people enjoy the series.
Kingdom Hearts - Don't understand the world's fascination with this one. Terrible button-mashing combat (with an even worse camera) and some of worst stories Square has done.
That's all I think of off the top of my head.