My vote goes to Fiesta Rewards. This is the "rewards" program for the Fiesta Americana Hotel chain. They're primarily located in latin america. I guess shoddy ripoff service is tolerated there.

However, their program is absolutely horrible. My mom has been trying to get 30k points posted from last summer. She faxed receipts, sent emails, called their "customer support" line, and still nothing.

This year when in CUN we had the hotel staff working on the problem. They did a lot of faxing and photocopying. The final result was still zero points posted.

Hopefully my mom's experience will serve as a warning to anyone thinking of joining this worthless program. Their hotels are great, but the rewards program is just plain bad.