No, reviews are based on opinion, yes, but the reviewer should still have some level of objectivity. Her pushing her agenda in her reviews is something that shouldn't be done, and it's the reason many people dislike her. Not because her opinion is different, but because she used reviews as a vehicle to press her issues (I don't know if she did it for the clicks, but it's still bad). I don't think there's anything wrong with disliking that. Not to mention, she's one of those reviewers who has issues with higher difficulty levels and, iirc, she complained about exactly that in her Luigi review (which isn't even hard). Stuff like that is one of the reasons there's so much hand holding.
With that said, while annoying, it didn't affect me personally, I just avoided Gamespot (I'd check it out now but apparently it's still all around bad). Hopefully she lands on her feet, as I wish her no ill will.