What if it's encounter? What if it's still daily but it states that the damage dealt is an attack?
Saying that you have to hand out a daily stance as an at-will before it's better is being a bit ridiculous.
Uh... keep in mind that an Encounter stance is virtually as good as an At-Will stance - you can have it up, all encounter long, in every fight of the day.
Anyway, we're starting to get into really weird hypotheticals. I can't imagine the Knight getting any stances that aren't At-Will - that seems his entire design. Aegeri feels this will mean the Knight is an inferior class, forever, because he doesn't have Rain of Steel. Rain of Steel is certainly good - but it isn't required for every fighter, and a lack of it won't ruin the build.
Meanwhile, could they come out with feats that interact weirdly with Knights vs normal fighters? Sure, maybe. But worrying about things that only exist in hypothetical scenarios doesn't give you any cause to criticize things as they currently stand.
From what we have seen (the small amounts we have seen) the knight seems potentially balanced against other classes. What daily resources they have, if any, is the only real question up in the air.
Can you make really effective builds based on melee basic attacks? Yes, absolutely. I was rather worried about this...
...until I realized you could build such things already. There are effective melee basic at-wills already, in the form of Eldritch Strike or stuff like Righteous Brand and the Skill Domain. Take those, focus on Encounter/Daily powers that are Immediate or Free actions, and snatch up the various feats to boost basic attacks, and you can already achieve the same benefits as the theoretically optimized Knight.
And none of those benefits are game-breaking. Really good, sure, but so are all sorts of other builds.
Would it have been nice for WotC to toss out a bit more info? Sure. But these are all just a bonus for people to give a hint at what is to come. The expectation they need to reveal information to make a fully playable 1st level character, thus severely undercutting the actual need for the product itself? That's entitlement at its worst.
The stuff they've shown looks interesting. People will be coming up with nightmare scenarios regardless of how much more they revealed. There is certainly no
requirement for them to share anything at all. That's the bottom line - if people really feel that WotC's preview is so incomplete that it gives the wrong picture, and that this will drive away many of the people reading the preview, than maybe WotC made the wrong call.
But I'm guessing most of those people coming out with crazy hypothetical scenarios in which the Knight is useless/overpowered... would do the same thing regardless of how much info WotC gives out, and aren't likely to be their target audience for this product anyway.