Funny, I thought the whale just tasted like citrus-y beef. Maybe there's a huge variation in how its prepared (and maybe which whale species). I had whale as sashimi, roasted, and steak and they all tasted very similar to the cow equivalent. The Australian in the group said it tasted similar to kangaroo.
Hákarl smells much worse than it tastes. I thought it tasted similar to a strange fishy tofu with the texture similar to cheese plus eraser. Definitely took a while to get the taste out of the mouth, but it wasn't immediately gag inducing.
Definitely echo the sentiment of the lamb being delicious. Every time I had lamb it slid off the bone and had a nice balanced gamey-brine. Winter veggies seemed to be limited to tomatoes, cucumbers, bell peppers, potatoes, carrots, and arugula. The restaurants all said they get fresh shipments every morning from the greenhouses.