It's not only concern of iOS 5 excesses review, we have to find out about the weaknesses of iOS 5 too. So, here will presence some weaknesses of iOS 5, but it just based on the rumors from media outside :
1. There is no support for Flash in Web Browser
Whereas Flash is very important in the virtual world considering the number of Flash circulating on the internet. So, without Flash in the Web browser we can not see the flash of a site or the web
2.There is no quick option in turning off the Wi-Fi, Bluetooth and 3G
As users, we also need the speed to turn off the device features include Wi-Fi, Bluetooth and 3G. Wi-Fi, Bluetooth and 3G can waste the battery faster so need to be turned off when not in use.
3. There is no Facebook integration.
4.There is no Widget that has function for lockscreen
Without a widget that can facilitate a user to open it then it will be lockscreen inconvenience for the user to open a screen that has been locked.
5. Applications Folder are limited to 12 Top Applications
6.It does not support format DivX / Xvid (although there were plenty of special player format DivX / Xvid on the App Store)
7.It does not supports for File Transfer via Bluetooth to another phone.