I finished the entire trilogy on my PS2. All games are great, but I feel like Jak II is a huge improvement over The Precursor Legacy. The dark atmosphere, and the open world are so much better.
Jak 3 is great too, but the second game had a bigger impact on me.
It's exactly this dark atmosphere and open world that she didn't like. It's way too far off from the first game. She figured it was implemented to attract the GTA crowd but it just didn't fit the charcaters and the setting at all. Also many missions were super dumb and poorly executed with lots of cheap and unfair sections or instant deaths. She rage quitted several times. It really wasn't a pleasant thing to witness. Eventually she finished it, however not because she liked it but just to show it the middle finger.
The third game was a bit more enjoyable, though, so that's something.