Green Pepper offers a nice variety of dishes: each dish comes with 1 ~ 3 side dishes and an after meal sweet soup. If you enjoy variety, such as a bento-style meal, Green Pepper offers a break in the monotony.
Portions are OK, id say justified with all the different side dishes you get. I do not have much basis in comparing Korean food, but I had a pleasant experience with their Bibimbop, cold noodles and their bulgogi - even though I am usually incapable of digesting spicy foods... (they offer some non-spicy alternatives as well)
Service is fine. Cordial, acceptable waiting time, frequent water rounds.
Price is indeed high, even considering all the positive aspects.
I would recommend others to try it out and decide if the price is worth paying... The food here seemed more approachable than Korea Garten over at Pitt. Maybe its Americanized, but good for me!