Imu and Rocks were introduced too late in the story
At least Rocks is dead, but he has that same annoying Oden energy
WG is also bad, very boring and lame evil organization, very incompetent and non-threatening
Blackbeard's the best, very charismatic and fun character, great design and personality, good buildup, evil dude but not so evil that he becomes predictable
Marines used to be good, until Oda hitched them to the sinking Celestial Dragons ship
The Holy Knights are great, they add some color and life to the very uninspired World Nobles class