I actually couldn't get into PSP2. I was really excited to play it, but I think my mind was too set in the ways that PSP played, and I just didn't like the changes in PSP2. The same thing happened with PS0 on DS. I just couldn't get into it after playing PSP. PS0 is much worse though. It has one of the worst inventory/skill systems I've ever seen. Which is a shame because the Action Palette in PSP is beyond awesome. Not sure why they didn't just use that again.
The higher ranked missions with Dulk Fakis are pretty tough. Especially S ranked. He even has another form in the S ranked mission. I had a ton of fun playing through the hard missions after the Story Missions concluded. I recommend checking them out, but if it's not your cup of tea then so be it.
Congrats on beating Helga and Dulk Fakis. The ending isn't very great, but the journey was more than worth it IMO.
The horrible party AI you speak of is palpable. The best thing is that your party members come back to life after they die, so they end up not being a very big problem. It's almost like the developers knew that the AI was terrible, so they made it so they come back to life to appease you.
The party AI is so predictable that you can use it to your advantage. I found that my party members made great meat shields, and they were perfect for springing traps for me. You just have to know how to utilize them LOL.