As for me,
Rpg : I agree with you. I usually explore the worlds hidden items, quests and levelup my character until max level this is my first priority. Major storyline is my second priority. Well at least until my character is strong enough to face difficult enemies haha

Fps : I usually try to find hidden items, maybe bonus quest for more exp this is my first priority for fps too. Major storyline still second priority. hehe

ok now for MMO and MOBA I don't understand about those kind of gameplay. Because I just know FPS and RPG. Can you explain it to me about MMO and MOBA? Thanks