I went there a year back and i had no problem with a hand written passport. Most of the ppl in Qatar knows that our passport is not machine readible. Well The only problem I faced was regarding my luggage which i wouldnt call it a problem. They had a hard time figuring out where to go and had to manually type it in. Thats about it. After they enter the destination and gives you the boarding passes you are set to go. Its the same thing with other places you have your transit in. But i never went off the airport during my transit so I have no idea how the processes are on that. But yes, after the lugguage is on the airplane or send from USA, all I did was checked on the place where my transit was just to be sure.

Im glad that everything fell into place and didnt have any hassle whatsoever

Regards,
Mercy