The important part about coming here is to realize what this place is good for - a large quantity of food that's quick and cheap and is great for those take-out days when you the college student are overloaded with work and just don't have time to deal with another place.
Keeping that in mind, I don't worry about the service quality or authenticity of the food or anything like that. When I come here all I care is that I get my food quickly and that it tastes reasonably good. OE definitely has both of those qualities. Whether I order orange chicken or General Tso's or lo mein or chow fun - the food always comes out quickly and always hits the spot.
As a bonus, it's pretty close to CMU campus and definitely better than the Asian options there. If I were still a student, I would definitely keep coming back here for my Chinese take out!