Would be much more useful and help me trust it more if it 1) had everything disabled by default and allowed me to only enable modules that I wanted to use. Make it as slim and light as possible, then install those add-ons when users want them. And 2) if it didn't require WordPress.com authentication. Many "modules" have no need of wp.com authentication. Why not let us use those without authentication?
I appreciate Automattic offering some WordPress.com features for free, but it seems like something of a data-grab combined with an attempt to bolster WordPress.com usership. Sorry, but I don't use my WordPress.com account for anything really.... Make it useful and easy to me first, then offer me incentives to use/integrate it in my sites. Don't try to force me to use it with incentives and enticements when there was no real previous reason.