I played the beta and personally it just didn't do anything for me. The best thing I could say is that it looked pretty nice, but the performance was awful on PC. It would be buttery smooth and then all of a sudden have these random lock-ups for a few seconds.
The combat didn't really grab me or feel as good as I was hoping for. When I think of a superhero game that revolves around combat I think of something that's going to feel good like God of War, Arkham, or Spider-Man. But the combat here can't even be compared to those titles, not even a bit. The heroes felt different enough, sure, but that absent feeling I had with the combat as a whole resonated with every character. With each character I thought, "Welp, maybe I just don't like them, let's see how the next one is..." Rinse and repeat until there were no new characters to play as.
Iron Man was probably my least favorite, which is pretty crazy to think of considering you'd think he'd be one of the most fun to control. My favorite was probably Hulk. I don't think the game is awful, there is potential buried there somewhere, I just think what's there now isn't revolutionary in any way. Could that change? Maybe! But for now I'll just keep an eye on it and see how it's received.