Most RPGs I've played have good gameplay. Plus what "good" and "bad" gameplay can be really subjective. For example, I know a lot of people hate turned based combat nowadays and would probably call it "weak" gameplay while I find it to be the best kind in games XD
But for good story with bad gameplay would be Fate/Extra. Interesting story and such but the combat (while turn based) is almost 100% random. You have to GUESS what your enemy will do. When people say RPGs are rock/paper/scissors, they've never played this game... the battle system is almost ALL luck based o.o didn't help that you were guessing not just 1 attack, but 6! You had to guess and imput all 6 before you actually attacked