I think for me, Rune Factory 2 really cut my interest in the original Rune Factory because it moved at a faster pace and made me realize how slow and tiresome I found the original, which I didn't notice until after I'd played the sequel. None of the other sequels have made 2 obsolete to me, and I'd like to try a full play through of the original again someday, but that day is a long day's away because I just couldn't handle how slow it was back then, and I'm not sure I can now either. That's just because I have a very small attention span, though.