A couple of points:
Orient simply means "East" from Latin, so it's an old term and a lot of words in European languages originate with Latin. Oriental to me refers to medieval / pre-medieval China/Japan/Korea/etc. I don't see that it's offensive as used in "Oriental Adventures" any more than "Medieval European Adventures" which is the base setting of D&D, would be. D&D historically is like pulp fantasy which borrows heavily from many real world sources to create a fantasy world.
With that said, unless there is a latin-like culture in your setting and the fantasy China/Japan/Korea is to the east of it, there are probably better titles than "Oriental Adventures" for describing that kind of setting.
Orient simply means "East" from Latin, so it's an old term and a lot of words in European languages originate with Latin. Oriental to me refers to medieval / pre-medieval China/Japan/Korea/etc. I don't see that it's offensive as used in "Oriental Adventures" any more than "Medieval European Adventures" which is the base setting of D&D, would be. D&D historically is like pulp fantasy which borrows heavily from many real world sources to create a fantasy world.
With that said, unless there is a latin-like culture in your setting and the fantasy China/Japan/Korea is to the east of it, there are probably better titles than "Oriental Adventures" for describing that kind of setting.