Alright man, we get it. The game wasn't to your liking. Cool beans. To each their own.
Personally, I haven't played Lisa since 2.52b and I didn't touch the party content at all, but my experience of Lisa's evolution was definitely different than yours. For starters, she was never a prude. She was loyal, openly romantic and sexually active with Danny. I don't know about you, but that does not fit the definition of prude in my books. Modest? Yes. But nothing beyond unreasonable.
Secondly, her corruption factor is subtle and player controlled i.e you can have her corrupt on her own or force it and I remember taking the middle ground. As in, while she did not actively jump into cheating, I did pick choices that slowly toned down her exclusiveness with Danny. For example, flirting with the guy who is making a game, getting groped in public, getting close to Luka and his mom, voyeurism etc. All in all, my take on Lisa was to make her more outgoing and slowly shedding her rigid persona by being affected by events around her.
I can go on, but I've no intention of hijacking this thread and starting a chaos so here is my 2 cents on it: Most of the games that you listed, I've played as well, and I disagree that all of them edge out on Lisa. If I were to hazard a guess, I'd say you went into the game with certain expectations and came out dissapointed. Nothing wrong with that. It's normal. But, calling a dev kid or unskilled, just because his vision of a concept didn't match yours is.. for a lack of a better word, "immature" to say the least.
I'll leave you with this final saying on the matter in hopes that it brings my point across: "A game made for everyone, is a game for no one".