I love Persona 2 (both EP and IS), but the gameplay for both have not really aged well. At all. Hell, the rolling battle system for IS is an absolute mess (at the very least, EP introduced a turn-by-turn option), they're both pretty grind heavy especially in regards to negotiation and gaining tarot cards, and for any bit of criticism that can be made against the Once More system, it's still a step up from the "spam Strongest Fusion Spell on every turn have Maya/Lisa/whoever heal every single turn" that will literally autopilot you through almost every single battle outside of a boss spike or two (most notably, the Metal Trio in EP and the Final Boss of IS).
The story for both P4 and P2 IS/EP are pretty well done for what they set to accomplish and neither of them are perfect (biggest knock on P2's corner being Tatsuya's angst overload in EP).