Why Windows 8.1 is a failed operating system to me

I am using windows 8.1 currently.

The following features make me not a big fan of this OS.

1) The wifi problem. 

     The wifi reluctant to connect at times when you most need. Need to disconnect and connect many times to get it working. From windows forums got to know that it is the driver issue and they do not have any intention to fix it. The same machine I dual boot for ubuntu which works perfectly. 

I have followed some tutorials how to make this work but no success. The Machine I use is Dell inspiron N5050.

2) The Update.

   When you just want an urgent mail to send, open the computer then I see this blue screen preparing to configure system do not turn off message. and since my internet do not work It keep on showing 30% for some time then get through after a waiting period. I never know that it has been successful or not. 

3) Full screen apps do not work.

 I had run in to situation that the full screen apps do not work.I just wanted skype but it was not happening and since there was a problem with internet struggle to update and after updation it started working.

4) Login issue.

The internet is never get success at the time of booting unless i continuously switch the wifi on and off. Hence Authenticating time is more and some times it do not recognise and sign me as guest. 

5) Privacy issue.

I had put profile pic of the system by taking a photo suing webcam and shocked to see it was changed my online live account too. 

Skype now use the system password. Once changed skype password using the instruction provided and shocked that my machine password was the one i had changed.

The usability and intuitiveness for the OS is minimum. Ubuntu on the other hand it is the prefered OS.

But stuck with windows because some application dependent. 

"Windows a Bad OS with good applications, ubuntu Great OS with limited/buggy applications"