Congrats on finishing Persona 2: Innocent Sin! It was an arduous journey, but you made it to the finish line! But you know, this is just the beginning; you still have to finish Persona 2: Eternal Punishment. Like right now.
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Just messing around. You're probably not going to want to touch Persona 2:EP for a long, long time (have you considered reading or watching a LP?)
Re: Gameplay
I definitely sympathize with you here; the PSP version of P2:IS is just a mess. I think you would have vastly preferred the PSX version, as the
attack commands can be entered quickly. Also, battles are more challenging and the game runs smoother. And the kicker? Random encounters are effectively
halved. Don't get me wrong, the PSX version of P2IS's gameplay is hardly something I would call
good, but it's miles better than the PSP version.
Re: Tatsuya
You are absolutely right here. Tatsuya should not have been a silent protagonist. The dude's got the most defined backstory out of any of the other Persona protagonists, and several of his relationships are "solid" and set in stone. He vastly improves in P2:EP (to the point where he ends up being the best character, imo) but in exchange, they pass on the silent protag baton to Maya, and it ends up killing her character.
For what it's worth, EP's narrative is several times better than IS. It doesn't meander about with pointless plot threads. It's actually a lot more focused and the writing is stronger (though it suffers from... plot reuse). I actually really enjoyed EP narrative, and I have a feeling you'd enjoy it too (or at the very least, you'll like EP protagonists, such Ulala or Katsuya)