I liked the reviews when I was a little younger but revisiting their not that good. Most of her critiques don't really hold up when you really think about them. Though I will admit there are some fair criticisms in them but besides that it's mostly harsh nitpicking.
I'm in much the same boat. I remember when her sequel reviews were coming out still, back when That Guy With the Glasses was still a website. I hadn't watched the movies in a very long time or not at all with the later sequels at that point, and I found the reviews entertaining enough, but thinking back, she's both unrelenting and, frankly, not that fair or observant with the films. I distinctly remember her absolutely hating IV having Spike speak, but I just can't agree with that at this point. It's not a constant thing and it's fairly reasonable considering what's happening in the film. Mind you, I'm fairly critical of IV myself, but that isn't a critique I'd make. She seemed to also imply at several points that Spike should just be mute and, really, kinda stupid, while also complaining about his stupidity, I believe, in VII. Dismissive is the word I'd use, and entirely unwilling to take the sequels as they are, which is how most people feel about these movies, but doesn't make for the fairest of critique. I don't agree with all of Bobsheaux's points on the sequels, but I found his reviews much more fair and thoughtful.
Granted, I admit, I haven't watched MarzGurl's reviews in a long time myself, so hey, maybe I'm totally off and being unfair myself. They're just a fairly strong memory in my mind.