I was emailed this by a friend of mine. Thought I would run it by you guys.
can't charge the phone while it's turned off without it turning on again
no notification center
no alternate web browsers
no alternate keyboards
can't close apps from "multi task" screen
multi-tasking itself very weak compared to other platforms
no text reflow in IE10
FM radio support removed in WP8
no orientation lock
no custom notification sounds
can't control ringtone and media volume separately
no USB storage
need to completely wipe your phone to change active live ID
can't change font size in SMS app
no decent system wide maps app
fragmented applications only available for Nokia phones
can't keep WiFi alive while the phone is locked
no file explorer
no voice assistant like Siri / Google Now
no battery percentage unless you install an app for it
no google talk / whatsapp/other IM integration into the messaging hub
no smart dialing
can't disable auto rotate
no G+ support in people hub
still no custom colors for tiles
no gapless zune playback
can't set manual IP address / DNS
no folders in apps list
no basic features ported to WP 7.8 (like data smart)
can't manually manage music / files on the device via your computer
no FLAC support
can't block numbers
relatively low quantity of apps
existing apps have a worse release cycle and almost always less features and support
forced to market the platform with celebrities
random reboots with WP8 devices
can't separate phone contacts from facebook contacts
chevron unlocker is dead in the water
locked bootloader / no possibility for an alternate OS
no linear screen brightness adjustment
no USB host
can't attach PDF files to an email
can't charge the phone while it's turned off without it turning on again
no notification center
no alternate web browsers
no alternate keyboards
can't close apps from "multi task" screen
multi-tasking itself very weak compared to other platforms
no text reflow in IE10
FM radio support removed in WP8
no orientation lock
no custom notification sounds
can't control ringtone and media volume separately
no USB storage
need to completely wipe your phone to change active live ID
can't change font size in SMS app
no decent system wide maps app
fragmented applications only available for Nokia phones
can't keep WiFi alive while the phone is locked
no file explorer
no voice assistant like Siri / Google Now
no battery percentage unless you install an app for it
no google talk / whatsapp/other IM integration into the messaging hub
no smart dialing
can't disable auto rotate
no G+ support in people hub
still no custom colors for tiles
no gapless zune playback
can't set manual IP address / DNS
no folders in apps list
no basic features ported to WP 7.8 (like data smart)
can't manually manage music / files on the device via your computer
no FLAC support
can't block numbers
relatively low quantity of apps
existing apps have a worse release cycle and almost always less features and support
forced to market the platform with celebrities
random reboots with WP8 devices
can't separate phone contacts from facebook contacts
chevron unlocker is dead in the water
locked bootloader / no possibility for an alternate OS
no linear screen brightness adjustment
no USB host
can't attach PDF files to an email