I jumped into Assassin's Creed: Valhalla on Amazon Luna yesterday, and was a little surprised at how unstable the game seemed. It was losing a lot of frames of animation, and the cut scenes in particular seemed choppy. However, I suspected that the performance problems might have been a mixture of it being the first day UbiSoft+ was available on Luna, and my own overly stressed internet.
Taking a look today at a less busy time confirmed my suspicions a bit. The game was looking much smoother, with far fewer issues. I also noticed the sound dropping out a lot yesterday, which I didn't see today at all. I'll keep checking back on the performance and posting it here, so keep an eye out!
UbiSoft+ is available for $14.99 a month, and the subscription will allow players to play a large variety of Ubi games on both Luna and Google Stadia. Luna subscriptions are $5.99 a month, and are available through Amazon.