I liked that eppisode....a lot actually.
Good:
"You do realised we have just opened Pandora's Box" Mama P. is the best character in this.
Sylar the Sailorman at the end with the spinach = awesome.
Nathans death is going to have great repercussions on Peters character devolopment. Who shot Him? HRG? Claude? A New Guy?
The fact the next volume is called 'Villains'. Promicing.
Hiro is badass.
Bad:
Not letting Maya stay dead. Seriously we've waited all season for that, i literally jumped for joy when she got shot, only to have her brought back to life seconds later.
And I worry for Monica and Micah in the next season. Somethin tells me they'll be dragging next season down. Where can they go?
Claire has even less potential than these for the next volume. But these last points are more bad for the next season and not 'Powerless'.
I think Nikki Will be back. Or will Jessica be back?? And Peters blood couldnt cure Nathan since his power is mimicry, not healing and his blood probably doesnt have the same properties as Adam and Claire, he gets the power from his mind, not blood, or someother convienent plot hole.
Adam WILL be back....at some point.
So what villains have we got? Sylar. The company (with Angella back in from the looks of the end, Bob, Elle and a lot of possibilities, not to mention Noah is working with them), Maury freeing Adam through somesort of mental communication is possible as well, he is a telepath after all.