Did I like it? Loved it. Do I think it should of been made? No. I was far happier with FFX's ending then a sequel.
Despite what people say, there is nothing within FFX-2 that devalues the original integrity of FFX. I don't see any reason why it shouldn't have been made.
I would agree with that had the game ended with the "Normal" ending. The "Good"/"Perfect" endings are what really ruined the emotional impact of FFX's ending for me.