Things that have disappoint me or I hate that happen:
Haku's death
Team 8,10 & Guy not getting enought screentime
The Hyuga's story, abilities & byakugan never getting boost, upgraded or simply was never showed relevance.
Minato going Bijuu mode
Sharingan & Rinnegan practically becoming the "ultimate weapon " on everything
The war
Yamato disappering/getting kidnapped and use as a human production machine (poor Yamato TT A TT)
All female's development, speciall Sakura's
Things that I think will suck if happen:
Neji & Jiraiya getting Edo tensei or magically revive.
Naruto & Minato not getting an emotional father/son moment ( I need this!!)
Hinata,Kakashi and Naruto dying.
Not seeing Naruto become Hokage.
Not seeing someone from team 7 dying (that wasn't Kakashi) dying.
Naruto doing the Talk-no-Jutsu to the Jyuubi, Madara and even try again Obito and suceding.
Orochimaru being good.
not establishing a couple for Naruto, specially if it's not Hinata ( not establishing a couple will be mean, constant arguments still about what character would be better for him and trying to prove in every corner why. Oh god, I want that shit over already.)