I've owned Exile 2, CF2 and Ordyne. I also remember being disappointed with Exile 2, and I sold it stupidly (I would like to get it back one day, maybe) but I seem to remember it having some cool music just like the first game did. Ordyne I enjoyed, I remember it being kinda on the easy side so I was done with it really fast. Kinda cool though looking back, as the only other way you would have played ordyne is a Japanese arcade machine. CF2 is the only game I still have, but I think it might be the plainest, most boring RPG I've ever played - strictly gameplay wise. I like the cutscenes and the music of course, that's why you bought the game in the first place, right?? But a lousy, simplistic RPG underneath of all that.
For me, the only one that comes to mind right now is Space Harrier. I loved the arcade game so I thought it was a lock, but I was incredibly disappointed with the port. The voice I remember being particularly bad.
Oh, and I just remembered this one: I might get lynched for this, but Cotton - I just didn't like it, traded it for something else.. and I'm a shooter fan in general, that one just didn't do it for me.