On my recent visit to Pei wei, I asked them to not to add any sugar cos I didn't want my Pad Thai to taste sweet but when I ate it, it still tasted sweet though not too sugary. I tried one at a local Thai Restaurant and the Pad Thai there also tasted bit sweet.
I guess Pad thais are made with different tastes I guess. Also regarding the Mongolian beef, it is delicious but the ones sold by Peiwei is just too sweet. The one I usually eat at the local small chinese restaurant never tastes sweet.
I had this one in Khaosan road 3 yrs ago. so tasty, so fresh and so affordable!