Played 2 games of Sentinels of the Multiverse yesterday. This was quite fun and I have the physical copy as well so I know what to expect if I ever play it.
The graphics and UI are sometimes slow and not as intuitive. I had a card where when the thing it was attached to did damage you raise or lower the damage. It was so clunky to get the +1/-1 choose for all energy types. This isn't that clean like say the Small World UI where everything is relatively easy to choose and do.
There are lots of powers and the decks are prebuilt so it's easy to get in and play. I do feel that eventually you will want expansions and the $19.99 Season Pass packs at least 2 mini decks and 2 major expansion packs. The gameplay is intuitive and straightforward and is easy to pick up and the tutorial is alright.
It might be a bit simple for some cause these heroes don't level up but just use cards/powers/equipment. It's fun though and I like when you get your team going helping each other out to take out not only the main bad guys stuff but the environment as well. I can see this becoming one of my play in 30 minutes type games and I will be seeking out a discount on the season pass.