I think I'm gonna make a few enemies by saying this, but FFIV did this to me. I placed a bit of risk and got FFII earlier this year, wound up liking it quite a bit, and thought FFIV would be just like FFII, but more locations, better characters, better fighting, better everything, right?
Hooo boy. This is just me, but: Characters that keep ditching the party, making me save constantly before any cutscene happened in case I'd lose valuable equipment, in FFII you just knew after a while that party member number four wouldn't stick arround long. Also, you could save ANYWHERE. (Screw you, demon wall.) Also, I'm someone who likes to thoroughly think a situation through before doing anything, but FFIV's more action based combat made me hysterical and paranoid and constantly had me target the wrong enemy, or accidentally hammer on the wrong attack, and once you select an enemy, you better damn hope you didn't piddle it up someone because you can't undo the damage. contrast to FFII, unless you piddled up with character #4.
Also, this is just me, but why did I have to endure the dried up mana pit that is Tellah? Yes, I enjoyed him as a character, the gameplay and story intergration is all really nice, but I spent so many ethers on him it wasn't even remotely funny.
On another note, the Golbez fight was intense and amazing and I wish the rest of the game was like that. Maybe I just set the bar too high for FFIV. I went with FFII expecting it to vomit poo-poo all over my face but wound up enjoying it, bought FFIV promptly afterward and expected diamond skittles to be dispensed, but got yoghurt instead. I partly blame myself for the disappointment.