The problem wasn't (or at least, shouldn't be) that it was too controllery, it was full control AND Full striker level damage. So you got to be a striker (2[W]+dex vs many foes(+sneak attack on one) )AND an amazing controller, AND you hit a swarm of enemies with no chance of hitting allies. It was really, really good, with little downside and no competition. Check out other level 1 dailies for a rogue. None of them come close to the un-errattaed blinding barrage, most of them are single target 2W with single target minor control, or single target 3w with no real secondary effect (maybe a 'target ref').
A blast 3 for 2W and NO effect would be a pretty good in that group. Add blind, a better effect than any of the other powers, even though its 'just' until the end of your next turn (ie, they can't save against it before your next turn, they will still be blind on your next turn, and for a full turn of your allies, guaranteed) and not save ends....It was not a balanced selection.
As I've said before, Rogue dailies are not their most impressive feature, they shine elsewhere. The question to consider is "What do you do with a power much more powerful, useful, controllery, and strikery than its same-level siblings?" Do you increase the others so all rogue dailies are ZOMG control and darn good damage? Do you destroy the one that doesn't belong? Are the other powers too weak? Is the nice one too powerful? What power level should rogue dailies be?
In the end, the designers-that-be decided that it was okay for rogues to have control powers, but not control powers that dealt enough damage that without the control it was still competing for best level 1 daily. You can argue I'm wrong about how much damage a 3x3 2W burst really is (or anything else I've said, I guess), but I really think its more than any other level one blinding (or equivalent control, like daze) power does. *shrug*
So thats what (I think) happened. The problem wasn't that you can't blur the role lines, its that you shouldn't have one power to rule them all. Effects within a power (especially blind) need to be paid for, even by controllers, and for strikers the currency they buy other options with is reduced damage. It's still great control.