Regarding DeathQuaker's thoughts on Peter's thoughts:
I'm kind of looking forward to even-more-psycho Isabel once she wakes up from the Mirakuru. But I agree, she nor the story sold the "I am a woman scorned!" story very well.... even if it is very true to the comics, from what I understand.
What really bugged me is that she proclaimed, "Do you think that I am just some jilted lover?" And for a moment, I was expecting some more powerful motivation or something genuinely serious... and instead, nope, jilted lover is it.
Slade's motivation is equally absurd, but it works just fine because he is literally insane due to the drug. But having this motivation for her felt pretty weak. If they just played up the greed part of it - the chance to take his company, gain power, no longer feel helpless, etc - I could totally buy it, but they really seemed to emphasize the parts that don't hold up under much scrutiny.
The big wall-banger there is of course that if Ollie really knew about a possible cure and didn't seek it out for Roy's sake, it makes him to look waaaaay more selfish and idiotic than I think the writers intend. Or maybe the writers did intend that.
Yeah, that was the thing that most bothered me about the episode. Especially since, again, it felt like they could have come up with some sort of explanation. ("We knew there was a cure, but knew we didn't have the resources for it, so didn't want to create false hope.") But the entire "I didn't talk about it, because I felt bad about this one moment of the backstory..." just felt kinda weird.
On the other hand, I think it did rule out the speculation I've heard about Ivo being Felicity's father, since Ollie namechecked Ivo and Felicity didn't show any unusual reaction.