I tried Steel Path Circuit last night for the first time, and overall enjoyed it.
At first, I was hesitant because of what I was given, but after a couple of rounds, the decrees made things simple. I also went in with a full group, so there were better chances that someone got a good Warframe to carry the early rounds.
I had fun using a Warframe that I wouldn't normally choose and weapons I wouldn't normally use. Admittedly, it's not a game mode that I could spend all day playing, but going in for the rewards each week seems doable.