I disliked Jollibee's Yum burger for the amount of mayonnaise(or whatever sauce they put on it). Sa sobrang dami parang tinakpan niya yung lasa at texture ng ibang parts ng burger. Sa bagay, dapat hindi masyadong mataas ang expectasyon ko sa fast food, pero parang humihigop lang ako ng mayonnaise.

It's been awhile tho since I've last had it so maybe(hopefully) things changed?

Also pardon me as I've also just realized this doesn't quite answer the question, but I wanted to put this out there.

When the burger falls apart kasi masyadong basa na siya.

The bun. If it's too airy and dry and not even toasted in the inside. (Looking at you Zark's)

Yung hindi quickmelt na keso sa jabee dati.

"Juicy" patty. I mean, a patty that was frozen for months.