Oishii is definitely one of my favorite places (and one of the only places) to go on campus for Korean/Japanese cuisine. I frequently order the bento boxes, specifically the spicy pork bento and chicken katsu. The katsu is sometimes as dry and rough as the chopsticks you're eating it with, but it varies every time I go. The vegetable udon and gyoza that come with the bento are all really good. For me, the bento is enough for about 1.5 meals, but I also eat very little so I can see some people complaining about the quantity of food--back at home, I'd order bento from H-Mart for about the same price and it would come with much more of everything.
I've also had the spicy pork bowl, which was good but not as flavorful as I expected it to be. It was definitely spicy, but not much else.
I still really like Oishii because it's probably one of the best places to go for Asian food in the area. Service is quick and staff are friendly.