For me personally part of my dislike comes from fanboys.....but that aside I feel like they are written as a helpless and opressed clan, but they really weren't.
People say they were screwed over and what not, but they were called a Noble Clan! How can you feel opressed when you are one of Four Clans with special recognition?! On top of that, they were specifically put in charge of the Police Force....instead of seeing it as a way to help the village, they thought they were being put down....I just don't get it.
The drive for power that the Uchiha took is basically what gives them a negative light in my eyes. They discarded all of the positive things they had in the village, and thought the only option was through revolution that they could be satisfied. Basically they saw themeselves as better or more deserving than everyone else, and it didn't make sense. The Senju were basically gone, and the people in charge weren't even the Senju when they went to rebel. No other clan was being placed above them, and in fact once again they were placed above other clans.
Then, with their massacre everyone says it is the fault of Konoha or the Senju or Tobirama, but they forget the key element: Who was in rebellion?! Answer: The Uchiha....they honestly have the largest role to blame in their deaths.
Despite all of this, I still have respect for the clan, and could possibly come to like them more depending on Sasuke's choice. Itachi, Shisui, and from context clues Izuna have all been kind, loving, and selfless individual...heck even Obito at a time was a great shinobi. Between teh four of them I keep from hating the clan because I know there were people in the clan that didn't think they were all that.
I guess that is my speal: In a summary, I dislike how they are commonly portrayed, I dislike how they acted, but I respect their power and I respect the members within the clan that display the greatness the Uchiha have the potential for!