My cringe doesn't come from it being a woman as I do recall the original series ending with a woman taking Ralph's place after he screwed up so bad that the aliens stripped him of the suit.
No I just cringe at yet another 80's property getting the reboot treatment. At least with the impending Knight Rider Heroes project I've read about, Hasselhoff is more directly involved and the 2008 series is disregarded.
As to the new heroine being irresponsible, well Ralphs' problem as I recall was that he always felt he was in way over his head, had confidence issues with the usage of his powers and of course he lost the manual, TWICE!
So what is this new person's excuse?
I mean seriously if someone be they human or alien bestowed powers on me I would endeavor to take as much time as needed to read all manuals and help files so that I knew what I could do even if I still needed practice.
Case in point, one of the GLC spectrum rings chooses me as its wielder. You better believe that I'd hope it to be a green or blue one (I'd look awful in a star sapphire suit) and you better believe I'd be getting all the instruction I could both from an experienced user and also asking the ring's own A.I.
Also an example of a character that gained alien powers and not the instructions that slightly predates Greatest American Hero would be Richard Ryder.
I've stopped caring about the constant revamping/rebooting of old things. I'd prefer they not, but whatever.
Her excuse is what worries me. She's being hyped as an aimless lush. I really hope that's not it. I'd rather she have a mundane but purposeful life that gets a wrench thrown into it.