For the most part many of the issues you describe here are only minor niggles for most people.
The Facebook chat option in the messaging app didn't support stickers or photo sharing, Facebook Messenger is a worthy alternative with much more functionality.
The crackling sound you describe here, is it like a pop sound when your scrubbing through media? On my Lumia 520 whenever I skip to a further part of any video I hear a cracking/pop noise as well. I hope this is fixed.
Cortana is arguably one of the most fun features of Windows Phone 8.1 and it has made me a lot more productive, it also brought new life to the Windows Phone OS, Cortana is just amazing.
Other than that Windows Phone also brought support for a whole new set of APIs to create amazing apps, like the ones your seeing in the Store right now. Also brought the ability to store apps in the SD Card, VPN and file management capabilities.
It also resolves one of the biggest issues plaguing all Windows Phone, slow shutter/focusing speed. The new API supports continuous focus enabling you take much faster photos, Nokia Camera in Lumia Cyan and 1shot by Invoke IT Limited leverage this new feature.
Hate is a strong word, sure there are problems with Windows Phone 8.1(like Xbox Music app) however it is still a very amazing update.
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