Android is a very nice operating system, people like it because it’s highly configurable. One of the major players in this game - Samsung Mobile - annoys it’s users with certain “features”, which you mostly can’t switch off or get rid off.
Even more annoying - for me - that’s the only Android option I get offered by my employer. The alternatives are iPhone, or Blackberry. So not really an option. Two years ago I switched to a Samsung S3, and a few weeks ago it was time to renew the contract, so shortly before Christmas there was a box with a shiny new S5 waiting for me in the office. Using the new mobile for two weeks now, I realized that Samsung remains true to themself and added more annoying functionality over the past two years.
Samsung is churning out dozens of different mobile devices every year. Maybe they should hire a few User Interface designers, or simply start using their own stuff, and see how annoying it is to use.