My non vegetarian husband and I ( life vegetarian for 56 years, can I please point out ) ate here twice on our recent Oslo visit. The first time was on a Sunday and yes, I understand why there are comments on here about the surroundings. It is not a restaurant but the place is clean and the staff helped us understand how the place operates. Sunday we did the buffet and there was a big choice of cold raw food ( hummus, sweetcorn, cucumber, leaves etc are just a few of the items I recall ) and hot food - pasta bake, and some very nice potato wedges.
The second time we went there was a tofu and veggie curry on offer - yes, not the spiciest but they are mass catering. It had real veg in there - actual cauliflower and carrots, not frozen, and was tasty, with rice and poppadums. For 100 kr each, it was such good value - we went to an Indian restaurant in Oslo and had a starter each, main course each, mango lassi and 2 small bottles of water and although it was nice, no way was it worth 700kr. Thanks Vega for being open on Sundays and evenings, we were able to eat well in Oslo. I think you have to remember you are not at home and that food is different around the world - methods of cooking and flavours may not be what you are used to.