Xbox has a Smartglass app that can be used to type messages and etc. instead of external keyboard support.

But, where are the Amazon Verified Purchasers?

Failure rate
24month
Xbox 360 23.7%
PS3 10%
Wii 2.7%

24hours
Xbox 360 1.19% (Without RROD 0.59%)
PS3 0.57%
Wii 0.31%
Source: SquareTrade

1% failure rate is a serious problem if it happens within 24 hours.

iPhone, android phone, tablets and iPad is better for sharing your bedroom activities with the NSA. And you don't event have to get a new one, since you probably already own one.