Not the worst place in the world, However service was pretty bad.
We had to ask three times where the rest of our drinks order had gone. The waiters english was passable at best, although he did repeat our order to make sure that he'd got everything down. However when our food did arrive (all at different times) there were a couple of dishes missing.
The food itself was ok, but rather bland. I get the feeling some dishes are done better than others. Portions of rice were just slightly too small. generally it was a bit too Monosodium for my liking.
I was very surprised to see the 10% tip automatically added as we didn't get a good service and we weren't exactly a huge group.
Overall I would say that it might be worth poping in if your desperate for some Thai food, although there are much better places in Oxford.
Would I go again; No - only if forced.