how do you feel of no Jafar and why did this have to conclude the whole

I feel Jafar was getting old as a villain you couldnt have had him three in a row, especially as his death seemed so final previously.

It's not the definitive ending; the real ending to the Aladdin saga is an episode of the Hercules TV series, where Aladdin and Jasmine are already married and Jafar comes back through a deal with Hades. The only worthwhile episode of that cartoon, in my opinion.