no excuse not to have voice chat, especially as the wii U gamepad has a built in microphone. plus there are no OS features to be able to chat to friends in real time, another letdown from Nintendo. I love the excuses people keep wheeling out for why it doesn't matter, both Nintendo themselves and the fanboys, as none of them have much if any validity.
too much profanity/swearing - parental controls, option to turn it off, muted by default, friends only
game is so fast and over quickly it wouldn't be useful - even more reason you need precise comms with your team mates, every second is critical
game is so simple it's not necessary - should be obvious, the basic mechanics may be simple but depth from advanced strategies could be considerable
you can use skype, teamspeak etc anyway - why should you need to? give players the option. for example my PC is in a different room to the wii U
would create uneven playing field - kind of proves that strategy does matter
voice chat is useless anyway, i never use voice chat - that's great but what about people who do and get a lot out of it
anyone got any others?