Wizards have posted another preview, this time of the EDs in the book with the Guardian of the Void being shown off. It's a really pretty poor ED - especially given the quality of recent EDs that have perfect mechanics and excellent fluff like Thief of Legend (which I highly recommend looking at for examples of just how to do that). The ED doesn't give the same kind of resurrection mechanics common to other EDs, only a single stat boost and to add insult to injury requires the mediocrity to be spread around the party to even provide a good benefit. The fluff of these EDs is nice though, but the terrible mechanics relegate it to obscurity.
I honestly have to say the more mechanical crunch I see of this book the more worried I get about it. It's been extremely underwhelming so far.
I was going to object to your criticism, since the ED's level 21 feature is quite strong: +2 to your primary stat, plus regen while bloodied, is perfectly respectable.
Then I realized that the level 24 feature was terrible, the level 26 utility was a 1 round daily power that requires surges to use, and the level 30 feature is equivalent to what the sort of thing most ED's get at level 24.
It isn't a useless ED, certainly, but is rather bland, and the core concept itself is not that compelling - you have been anointed to stop a terrible ritual from happening. Epic Destinies should really be about the characters themselves, not about a single event they have been 'chosen' to stop.
Especially jarring is lack of any final fate for the character. What happens if you stop the ritual? What is your ultimate destiny? The final sentence given is literally just "fight some bad guy's servants and prepare for your final battle". Compared to becoming a demigod, or keeping the soul of a primordial imprisoned inside of you, or even just other ones like becoming a legendary warrior or archmage, this one just... doesn't quite work, for me.
Honestly, my opinion might change when I see the final book and more details, but the Epic Destinies are not feeling nearly as inspiring as they usually do. As I said above, Epic Destinies should be about the characters themselves achieving something awesome and unique. Almost every single one of these destinies involves the characters joining some order or being 'called by fate' to some service or being given some job by the Raven Queen.
That's the sort of thing that feels closer to a Paragon Path than an Epic Destiny. A stepping stone on the path to greatness - not an ultimate goal in and of itself.
Every other preview I've seen of the book has impressed me, but it is looking like the Epic Destinies may not be the books strongest point. Though, again, I'll hold final judgement until I see them in full, and whether they end up being more flavorful than they seem on first glance.